import re
import sys

def transform_line(line):
    def transform_word(match):
        word = match.group()
        return  ''.join(char.lower() if char.isupper() else char.upper() for char in word)

    pattern = re.compile(r'\b\w*[a-ząćęłńóśźż]+[A-ZĄĆĘŁŃÓŚŹŻ]\w*\b|\b\w*[A-ZĄĆĘŁŃÓŚŹŻ]+[a-ząćęłńóśźż]\w*\b')
    transformed_line = pattern.sub(transform_word, line)
    return transformed_line

def write_answer(row, ouput_file):
    with open(ouput_file, "a", encoding="utf-8") as file:
        file.write(row)


def main_function(input_file, output_file):
    with open(output_file, "w", encoding="utf-8") as output_file1:
        with open(input_file, "r", encoding="utf-8") as file:
            for row in file:
                write_answer(transform_line(row), output_file)

# output_file ='simple.out'
# input_file = 'simple.in'
input_file = sys.argv[1]
output_file = sys.argv[2]
main_function(input_file, output_file)