#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import hashlib

def md5digest(s):
    md5 = hashlib.md5()
    md5.update(s.encode())
    return md5.hexdigest()

def main():
    md5 = hashlib.md5()

    S = input()
    ans = md5digest(md5digest(S))
    print(ans)

if __name__ == "__main__": main()