diff --git a/Python/ch2.String/hard_counting.py b/Python/ch2.String/hard_counting.py
new file mode 100644
index 0000000..e52d2fc
--- /dev/null
+++ b/Python/ch2.String/hard_counting.py
@@ -0,0 +1 @@
+print(f'{int(input()):b}'.count('1'))
\ No newline at end of file
diff --git a/Python/ch2.String/pass.py b/Python/ch2.String/pass.py
new file mode 100644
index 0000000..e5f90f9
--- /dev/null
+++ b/Python/ch2.String/pass.py
@@ -0,0 +1,8 @@
+k = int(input())
+password = input()
+def co(ch, s):
+    i = s.find(ch)
+    return min(i , len(s) - i)
+res = 0
+for i in range(k): res += co(password[i] , input())
+print(res)
\ No newline at end of file