Cryptography - HW1.3 (Challenge-03)

import re


def decode(s):
    # from bytes to string
    plain_text_bytes = bytes.fromhex(s)

    # iterate over all characters
    for ind in range(256):
        # xor each char
        result = ''
        for t in plain_text_bytes:
            r = t ^ ind
            result += chr(r)

        # if given text is built with regex return answer
        if re.search("^[a-zA-Z0-9. -_?]*$", result):
            return result


if __name__ == "__main__":
    s = input()
    result = decode(s)
    print(result)