import re

def swap(file_path):
    pattern = r'\b(?=\w*[a-ząćęłńóśźż])(?=\w*[A-ZĄĆĘŁŃÓŚŹŻ])\w+\b'

    def swap_case(match):
        return match.group(0).swapcase()

    with open(file_path, 'r', encoding='utf-8') as file:
        for line in file:
            swapped_line = re.sub(pattern, swap_case, line)
            print(swapped_line, end='')

file_path = 'TaskF01/simple.in'
swap(file_path)