diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 73a39b0..e6590f5 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -1,11 +1,13 @@
 ---
-name: Codecov Coverage Report
+name: "Codecov Coverage Report"
 
-on:   # yamllint disable-line rule:truthy
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
+    secrets:
+      CODECOV_TOKEN:
+        description: "CODECOV Auth Token"
+        required: true
 
 jobs:
   run:
@@ -15,27 +17,28 @@ jobs:
     timeout-minutes: 10
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: ["ubuntu-latest"]
         python-version: ["3.12"]
     steps:
-      - uses: actions/checkout@main
-      - name: Setup Python
-        uses: actions/setup-python@main
+      - uses: "actions/checkout@main"
+      - name: "Setup Python"
+        uses: "actions/setup-python@main"
         with:
           python-version: ${{ matrix.python-version }}
       - name: "Cache PIP Dependencies"
         uses: "actions/cache@v4"
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
+          key: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-${{ matrix.python-version }}-
             ${{ runner.os }}-pip-
-      - name: Install prerequisites
+      - name: "Install prerequisites"
         run: |
           python -m pip install --upgrade pip setuptools wheel
           pip install -r requirements.txt
-      - name: Install pytest, pytest-cov
+      - name: "Install pytest, pytest-cov"
         run: |
           pip install pytest
           pip install pytest-cov
@@ -44,12 +47,12 @@ jobs:
         run: |
           python -c "import os; print(os.getcwd())"
           python -m pytest . --ignore=solutions --log-cli-level=INFO -v --cov-report term-missing --cov --cov-branch --cov-report=xml
-      - name: List test files
+      - name: "List test files"
         run: |
           ls *.xml
         # yamllint enable rule:line-length
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5.5.1
+      - name: "Upload coverage to Codecov"
+        uses: "codecov/codecov-action@v5.5.1"
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: coverage.xml
diff --git a/.github/workflows/flake8.yml b/.github/workflows/flake8.yml
index bd102b3..176cefb 100644
--- a/.github/workflows/flake8.yml
+++ b/.github/workflows/flake8.yml
@@ -1,19 +1,9 @@
 ---
-name: "Flake8"
+name: "Flake8 Workflow"
 
-on:   # yamllint disable-line rule:truthy
-  push:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
-  pull_request:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
 
 permissions:
   contents: "read"
@@ -33,21 +23,23 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         # This is the version of the action for setting up Python,
         # not the Python version.
-        uses: actions/setup-python@v6
+        uses: "actions/setup-python@v6"
         with:
           python-version: ${{ matrix.python-version }}
       - name: "Cache PIP Dependencies"
         uses: "actions/cache@v4"
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
+          key: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-${{ matrix.python-version }}-
             ${{ runner.os }}-pip-
       # You can test your matrix by printing the current
       # Python version
       - name: "Display Python Version"
-        run: python -c "import sys; print(sys.version)"
+        run: |
+          python -c "import sys; print(sys.version)"
       - name: "Install Dependencies"
         run: |
           python -m pip install --upgrade pip
diff --git a/.github/workflows/lint_test_report.yml b/.github/workflows/lint_test_report.yml
new file mode 100644
index 0000000..8e0813c
--- /dev/null
+++ b/.github/workflows/lint_test_report.yml
@@ -0,0 +1,83 @@
+---
+name: "Main Pipeline"
+
+on:  # yamllint disable-line rule:truthy
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: "read"
+  pull-requests: "read"
+
+jobs:
+  changed-files:
+    runs-on: "ubuntu-latest"
+    outputs:
+      python_changed: ${{ steps.python-files.outputs.any_changed }}
+      yaml_changed: ${{ steps.yaml-files.outputs.any_changed }}
+    steps:
+      - uses: "actions/checkout@v5"
+      - name: "Get changed Python files"
+        id: python-files
+        uses: "tj-actions/changed-files@v47"
+        with:
+          files: |
+            **/*.py
+            requirements.txt
+            .pylintrc
+      - name: "Get changed YAML files"
+        id: yaml-files
+        uses: "tj-actions/changed-files@v47"
+        with:
+          files: |
+            **/*.yml
+            **/*.yaml
+
+  yamllint:
+    name: "YAML Lint Workflow"
+    needs:
+      - "changed-files"
+    if: needs.changed-files.outputs.yaml_changed == 'true'
+    uses: "./.github/workflows/yamllint.yml"
+
+  ruff:
+    name: "Ruff Lint and Format"
+    needs:
+      - "changed-files"
+      - "yamllint"
+    if: needs.changed-files.outputs.python_changed == 'true'
+    uses: "./.github/workflows/ruff.yml"
+
+  pylint:
+    name: "Pylint Workflow"
+    needs:
+      - "changed-files"
+      - "yamllint"
+    if: needs.changed-files.outputs.python_changed == 'true'
+    uses: "./.github/workflows/pylint.yml"
+
+  flake8:
+    name: "Flake8 Workflow"
+    needs:
+       - "changed-files"
+       - "yamllint"
+    if: needs.changed-files.outputs.python_changed == 'true'
+    uses: "./.github/workflows/flake8.yml"
+
+  pytest:
+    name: "Pytest Workflow"
+    needs:
+      - "ruff"
+      - "pylint"
+      - "flake8"
+    uses: "./.github/workflows/pytest.yml"
+
+  codecov:
+    name: "Codecov Coverage Report"
+    needs:
+      - "pytest"
+    uses: "./.github/workflows/codecov.yml"
+    secrets:
+      CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
diff --git a/.github/workflows/pylint.yml b/.github/workflows/pylint.yml
index 0ae436f..ff25eb1 100644
--- a/.github/workflows/pylint.yml
+++ b/.github/workflows/pylint.yml
@@ -1,19 +1,9 @@
 ---
-name: "Pylint"
+name: "Pylint Workflow"
 
-on:
-  push:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
-  pull_request:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
 
 jobs:
   build:
@@ -25,25 +15,25 @@ jobs:
       matrix:
         python-version: ["3.12"]
     steps:
-    - uses: "actions/checkout@v5"
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: "actions/setup-python@v6"
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: "Cache PIP Dependencies"
-      uses: "actions/cache@v4"
-      with:
-        path: ~/.cache/pip
-        key: |
-          ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
-        restore-keys: |
-            ${{ runner.os }}-pip-${{ matrix.python-version }}-
-            ${{ runner.os }}-pip-
-    - name: "Install dependencies"
-      run: |
-        python -m pip install --upgrade pip
-        pip install pylint
-        pip install -r requirements.txt
-    - name: "Analysing the code with pylint"
-      run: |
-        python -m pylint --verbose $(find . -name "*.py" ! -path "*/.venv/*" ! -path "*/venv/*") --rcfile=.pylintrc
\ No newline at end of file
+      - uses: "actions/checkout@v5"
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: "actions/setup-python@v6"
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: "Cache PIP Dependencies"
+        uses: "actions/cache@v4"
+        with:
+          path: ~/.cache/pip
+          key: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+              ${{ runner.os }}-pip-${{ matrix.python-version }}-
+              ${{ runner.os }}-pip-
+      - name: "Install dependencies"
+        run: |
+          python -m pip install --upgrade pip
+          pip install pylint
+          pip install -r requirements.txt
+      - name: "Analysing the code with pylint"
+        run: |
+          python -m pylint --verbose $(find . -name "*.py" ! -path "*/.venv/*" ! -path "*/venv/*") --rcfile=.pylintrc
diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index fb740ab..7737a16 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -1,11 +1,9 @@
 ---
 name: "Pytest Workflow"
 
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
 
 jobs:
   test:
@@ -14,26 +12,26 @@ jobs:
     # indefinitely if something goes wrong
     timeout-minutes: 10
     steps:
-    - name: "Checkout code"
-      uses: "actions/checkout@v5"
-    - name: "Set up Python 3.12"
-      uses: "actions/setup-python@v6"
-      with:
-        python-version: "3.12"
-    - name: "Cache PIP Dependencies"
-      uses: "actions/cache@v4"
-      with:
-        path: ~/.cache/pip
-        key: |
-          ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
-        restore-keys: |
-          ${{ runner.os }}-pip-${{ matrix.python-version }}-
-          ${{ runner.os }}-pip-
-    - name: "Install dependencies"
-      run: |
-        python -m pip install --upgrade pip
-        pip install -r requirements.txt
-        pip install pytest
-    - name: "Run pytest"
-      run: |
-        pytest . --verbose --ignore=solutions --log-cli-level=INFO
\ No newline at end of file
+      - name: "Checkout code"
+        uses: "actions/checkout@v5"
+      - name: "Set up Python 3.12"
+        uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.12"
+      - name: "Cache PIP Dependencies"
+        uses: "actions/cache@v4"
+        with:
+          path: ~/.cache/pip
+          key: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-
+            ${{ runner.os }}-pip-
+      - name: "Install dependencies"
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install pytest
+      - name: "Run pytest"
+        run: |
+          pytest . --verbose --ignore=solutions --log-cli-level=INFO
diff --git a/.github/workflows/ruff.yml b/.github/workflows/ruff.yml
index 7666f2e..7e4659c 100644
--- a/.github/workflows/ruff.yml
+++ b/.github/workflows/ruff.yml
@@ -1,19 +1,9 @@
 ---
 name: "Ruff Lint and Format"
 
-on:
-  push:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
-  pull_request:
-    branches: [ main ]
-    paths:
-      - '**/*.py'
-      - 'requirements.txt'
-      - '.pylintrc'
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
 
 jobs:
   ruff:
@@ -31,7 +21,8 @@ jobs:
         uses: "actions/cache@v4"
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
+          key: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-${{ matrix.python-version }}-
             ${{ runner.os }}-pip-
@@ -44,4 +35,4 @@ jobs:
           ruff check --output-format=github .
       - name: "Run Ruff format check"
         run: |
-          ruff format --check .
\ No newline at end of file
+          ruff format --check .
diff --git a/.github/workflows/yamllint.yml b/.github/workflows/yamllint.yml
new file mode 100644
index 0000000..1d797de
--- /dev/null
+++ b/.github/workflows/yamllint.yml
@@ -0,0 +1,38 @@
+---
+name: "YAML Lint Workflow"
+
+on:  # yamllint disable-line rule:truthy
+  # Makes it reusable; called by other workflows
+  workflow_call:
+
+jobs:
+  yamllint:
+    runs-on: "ubuntu-latest"
+    # Adding 'timeout-minutes: 10' would prevent jobs from running
+    # indefinitely if something goes wrong
+    timeout-minutes: 10
+    steps:
+      - uses: "actions/checkout@v5"
+      - name: "Set up Python 3.12"
+        uses: "actions/setup-python@v6"
+        with:
+          python-version: "3.12"
+      - name: "Cache PIP Dependencies"
+        uses: "actions/cache@v4"
+        with:
+          path: ~/.cache/pip
+          key: |
+            ${{ runner.os }}-pip-3.12-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-3.12-
+            ${{ runner.os }}-pip-
+      - name: "Install yamllint"
+        run: |
+          python -m pip install --upgrade pip
+          pip install yamllint
+      - name: "Check yamllint Version"
+        run: |
+          yamllint --version
+      - name: "Lint with yamllint"
+        run: |
+          yamllint .
diff --git a/.yamllint.yml b/.yamllint.yml
new file mode 100644
index 0000000..0c01e2b
--- /dev/null
+++ b/.yamllint.yml
@@ -0,0 +1,3 @@
+---
+rules:
+  line-length: disable
diff --git a/Dockerfile b/Dockerfile
index 8a235c6..54894c4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,7 +38,8 @@ RUN pip install --no-cache-dir \
     flake8 \
     pylint \
     pytest \
-    pytest-cov
+    pytest-cov \
+    yamllint
 
 # Copy the rest of the code (including .pylintrc if present)
 COPY . .
diff --git a/README.md b/README.md
index 2877080..c3cd5c0 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,6 @@
 # [Exercism Python Track](https://exercism.io/tracks/python)
 
-[![Pytest Workflow](https://github.com/ikostan/python/actions/workflows/pytest.yml/badge.svg)](https://github.com/ikostan/python/actions/workflows/pytest.yml)
-[![Pylint](https://github.com/ikostan/python/actions/workflows/pylint.yml/badge.svg)](https://github.com/ikostan/python/actions/workflows/pylint.yml)
-[![Ruff Lint and Format](https://github.com/ikostan/python/actions/workflows/ruff.yml/badge.svg)](https://github.com/ikostan/python/actions/workflows/ruff.yml)
-[![Flake8](https://github.com/ikostan/python/actions/workflows/flake8.yml/badge.svg)](https://github.com/ikostan/python/actions/workflows/flake8.yml)
+[![Main Pipeline](https://github.com/ikostan/python/actions/workflows/lint_test_report.yml/badge.svg)](https://github.com/ikostan/python/actions/workflows/lint_test_report.yml)
 [![codecov](https://codecov.io/github/ikostan/python/graph/badge.svg?token=G78RWJWJ38)](https://codecov.io/github/ikostan/python)
 
 <div align="center"> 
diff --git a/codecov.yml b/codecov.yml
index ff4805c..63b1b89 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,4 +1,5 @@
+---
 ignore:
   - "**/tests/"  # Ignores all files within any 'tests' directory
-  - "**/*_test.py" # Ignores files ending with '_test.py'
-  - "test_*.py"   # Ignores files starting with 'test_'
\ No newline at end of file
+  - "**/*_test.py"  # Ignores files ending with '_test.py'
+  - "test_*.py"   # Ignores files starting with 'test_'
diff --git a/run_ci_tests.sh b/run_ci_tests.sh
index 716bb0c..3796ace 100644
--- a/run_ci_tests.sh
+++ b/run_ci_tests.sh
@@ -6,6 +6,10 @@ set -e
 # Display Python version
 python --version
 
+# Run YAML lint
+echo "Running YAML lint..."
+yamllint . || { echo "YAML lint failed"; exit 1; }
+
 # Run Ruff lint
 echo "Running Ruff lint..."
 ruff check --output-format=github . || { echo "Ruff lint failed"; exit 1; }
diff --git a/solutions/python/wordy/1/wordy.py b/solutions/python/wordy/1/wordy.py
new file mode 100644
index 0000000..8673c38
--- /dev/null
+++ b/solutions/python/wordy/1/wordy.py
@@ -0,0 +1,89 @@
+"""
+Parse and evaluate simple math word problems
+returning the answer as an integer.
+
+Handle a set of operations, in sequence.
+
+Since these are verbal word problems, evaluate
+the expression from left-to-right, ignoring the
+typical order of operations.
+"""
+
+import string
+
+STR_TO_OPERATOR: dict = {
+    "plus": "+",
+    "minus": "-",
+    "multiplied": "*",
+    "divided": "/",
+}
+
+WRONG_OPERATORS: list[str] = [
+    "plus?",
+    "minus?",
+    "multiplied?",
+    "divided?",
+    "plus plus",
+    "plus multiplied",
+    "minus minus",
+    "multiplied multiplied",
+    "divided divided",
+    "What is?",
+]
+
+
+def answer(question: str) -> int:
+    if "cubed" in question:
+        raise ValueError("unknown operation")
+
+    for item in WRONG_OPERATORS:
+        if item in question:
+            raise ValueError("syntax error")
+
+    digits: list[bool] = []
+    for char in question:
+        if char.isdigit():
+            digits.append(True)
+
+    operators: list[bool] = []
+    for key, val in STR_TO_OPERATOR.items():
+        if key in question or val in question:
+            operators.append(True)
+
+    if not any(digits + operators):
+        raise ValueError("unknown operation")
+
+    print(f"\n{question}")
+    return eval(_reformat(question))
+
+
+def _reformat(question: str) -> str:
+    # 1
+    question = question.replace("?", "")
+    # 2
+    chars: list[str] = list(char for char in question)
+    for i, char in enumerate(chars):
+        if char in STR_TO_OPERATOR.values():
+            chars[i] = f" {char} "
+    # 3
+    question = "".join(chars)
+    print(f"\n new question:{question}")
+    # 4
+    question_list: list[str] = question.split()
+    for i, item in enumerate(question_list):
+        # print(f"\nitem: {item}")
+        if not (
+            item.isdigit()
+            or item in STR_TO_OPERATOR.keys()
+            or item in STR_TO_OPERATOR.values()
+        ):
+            question_list[i] = ""
+            # print("\n#1")
+        elif item in STR_TO_OPERATOR.keys():
+            # print("\n#2")
+            question_list[i] = STR_TO_OPERATOR[item]
+
+    print(f"\n{question_list}")
+    print(f"\n{' '.join(question_list)}")
+
+    return " ".join(question_list)
diff --git a/solutions/python/wordy/2/wordy.py b/solutions/python/wordy/2/wordy.py
new file mode 100644
index 0000000..09feb08
--- /dev/null
+++ b/solutions/python/wordy/2/wordy.py
@@ -0,0 +1,118 @@
+"""
+Parse and evaluate simple math word problems
+returning the answer as an integer.
+
+Handle a set of operations, in sequence.
+
+Since these are verbal word problems, evaluate
+the expression from left-to-right, ignoring the
+typical order of operations.
+"""
+
+import string
+
+STR_TO_OPERATOR: dict = {
+    "plus": "+",
+    "minus": "-",
+    "multiplied": "*",
+    "divided": "/",
+}
+
+WRONG_OPERATORS: list[str] = [
+    "plus?",
+    "minus?",
+    "multiplied?",
+    "divided?",
+    "plus plus",
+    "plus multiplied",
+    "minus multiplied",
+    "minus minus",
+    "multiplied multiplied",
+    "divided divided",
+    "What is?",
+]
+
+
+def answer(question: str) -> int:
+    _validate_errors(question)
+    result: int = 0
+    new_question: list[str] = _reformat(question)
+
+    if len(new_question) <= 3:
+        try:
+            _validate_evaluation_pattern(new_question)
+            eval_str: str = "".join(new_question)
+            result = eval(eval_str)
+            return result
+        except Exception:
+            raise ValueError("syntax error")
+
+    while len(new_question) >= 3:
+        try:
+            _validate_evaluation_pattern(new_question[:3])
+            eval_str: str = "".join(new_question[:3])
+            val: int = eval(eval_str)
+            result = val
+            new_question = [str(result)] + new_question[3:]
+            if len(new_question) < 3:
+                _validate_evaluation_pattern(new_question)
+                return eval("".join(new_question))
+        except Exception:
+            raise ValueError("syntax error")
+    return result
+
+
+def _validate_evaluation_pattern(val: list) -> None:
+    if len(val) == 3 and not val[1] in STR_TO_OPERATOR.values():
+        raise ValueError("syntax error")
+
+    if len(val) == 2 and not val[0] in STR_TO_OPERATOR.values():
+        raise ValueError("syntax error")
+
+
+def _reformat(question: str) -> list:
+    # 1: Remove '?' mark
+    question = question.replace("?", "")
+    # 2: Convert all operators writen in word into proper math sign
+    question_list: list[str] = question.split()
+    formated_question_list: list[str] = []
+    for i, item in enumerate(question_list):
+        if not (
+            item.isdigit()
+            or item in STR_TO_OPERATOR.keys()
+            or item in STR_TO_OPERATOR.values()
+            or any(val in item for val in STR_TO_OPERATOR.values())
+        ):
+            continue
+        elif item in STR_TO_OPERATOR.keys():
+            formated_question_list.append(STR_TO_OPERATOR[item])
+        elif item.isdigit():
+            formated_question_list.append(item)
+        elif item in STR_TO_OPERATOR.values():
+            formated_question_list.append(item)
+        elif any(val in item for val in STR_TO_OPERATOR.values()):
+            formated_question_list.append(item)
+
+    return formated_question_list
+
+
+def _validate_errors(question: str) -> None:
+    if "cubed" in question:
+        raise ValueError("unknown operation")
+
+    for item in WRONG_OPERATORS:
+        if item in question:
+            raise ValueError("syntax error")
+
+    digits: list[bool] = []
+    for char in question:
+        if char.isdigit():
+            digits.append(True)
+
+    operators: list[bool] = []
+    for key, val in STR_TO_OPERATOR.items():
+        if key in question or val in question:
+            operators.append(True)
+
+    if not any(digits + operators):
+        raise ValueError("unknown operation")
diff --git a/wordy/wordy.py b/wordy/wordy.py
index 12a6fcb..da43570 100644
--- a/wordy/wordy.py
+++ b/wordy/wordy.py
@@ -44,33 +44,54 @@ def answer(question: str) -> int:
     _validate_errors(question)
     result: int = 0
     new_question: list[str] = _reformat(question)
-
-    if len(new_question) <= 3:
-        try:
-            _validate_evaluation_pattern(new_question)
-            eval_str: str = "".join(new_question)
-            result = eval(eval_str)
-            return result
-        except Exception as exc:
-            raise ValueError("syntax error") from exc
-
     # Reduce iteratively: evaluate the first three-token slice
     # and fold the result left-to-right.
-    while len(new_question) >= 3:
+    result: int = 0
+    while new_question:
         try:
+            if len(new_question) == 3:
+                _validate_evaluation_pattern(new_question)
+                result = _math_operation(new_question)
+                break
+            if len(new_question) == 1:
+                result = int(new_question[0])
+                break
             _validate_evaluation_pattern(new_question[:3])
-            eval_str: str = "".join(new_question[:3])
-            val: int = eval(eval_str)
-            result = val
+            result = _math_operation(new_question[:3])
             new_question = [str(result)] + new_question[3:]
-            if len(new_question) < 3:
-                _validate_evaluation_pattern(new_question)
-                return eval("".join(new_question))
         except Exception as exc:
             raise ValueError("syntax error") from exc
     return result
 
 
+def _math_operation(question: list[str]) -> int:
+    """
+    Compute a single binary arithmetic operation.
+
+    Expects a three-token slice like ``['3', '+', '4']`` and returns
+    the integer result. Division performs floor division (``//``) to
+    match exercise rules.
+
+    :param question: Three tokens ``[lhs, operator, rhs]``.
+    :type question: list[str]
+    :returns: The computed integer result.
+    :rtype: int
+    """
+    math_operator: str = question[1]
+    result: int = 0
+
+    if math_operator == "+":
+        result = int(question[0]) + int(question[-1])
+    elif math_operator == "-":
+        result = int(question[0]) - int(question[-1])
+    elif math_operator == "/":
+        result = int(question[0]) // int(question[-1])
+    elif math_operator == "*":
+        result = int(question[0]) * int(question[-1])
+
+    return result
+
+
 def _validate_evaluation_pattern(val: list) -> None:
     """
     Ensure a token slice matches expected evaluation patterns.
@@ -138,16 +159,3 @@ def _validate_errors(question: str) -> None:
     for item in WRONG_OPERATORS:
         if item in question:
             raise ValueError("syntax error")
-
-    digits: list[bool] = []
-    for char in question:
-        if char.isdigit():
-            digits.append(True)
-
-    operators: list[bool] = []
-    for key, val in STR_TO_OPERATOR.items():
-        if key in question or val in question:
-            operators.append(True)
-
-    if not any(digits + operators):
-        raise ValueError("unknown operation")