#!/usr/bin/env python3
import sys


def decode(s):
	s = bytes.fromhex(s)
	return ''.join(chr(i ^ s[0]) for i in s[1:])


if len(sys.argv) > 1:
	it = sys.argv[1:]
else:
	it = sys.stdin

for s in it:
	print(decode(s.strip()))