hackerranck_swap_case.py

def swap_case(s):
    string = ""
    for char in s:
        if char.islower():
            string += char.upper()
        elif char.isupper():
            string += char.lower()
        else:
            string += char
    return string

if __name__ == '__main__':
    s = input()
    result = swap_case(s)
    print(result)