jfz-2023-s473616/TaskF01/run.py

import re

def swap_case(match):
    return match.group().swapcase()

if __name__ == "__main__":
    while True:
        try:
            line = input()
            if not line:
                break

            result = re.sub(r'\b(?=\w*[a-ząćęłńóśźż])(?=\w*[A-ZĄĆĘŁŃÓŚŹŻ])\w+\b', swap_case, line)
            print(result)

        except EOFError:
            break