#!/usr/bin/env python3
import argparse
import base64

parser = argparse.ArgumentParser()
parser.add_argument("txt")
args = parser.parse_args()


def main():
    try:
        processed_str = base64.b64decode(args.txt)
    except base64.binascii.Error:
        processed_str = base64.b64encode(args.txt.encode("utf8"))

    print(processed_str.decode("utf8"))


if __name__ == "__main__":
    main()