#!/usr/bin/env python3
import string

def main():
    l = string.ascii_lowercase
    invl = (string.ascii_lowercase)[::-1]
    N = int(input())
    S = input()
    ans = ""
    for ss in S:
        ans += invl[l.index(ss)]
    print(ans)
    return

if __name__ == '__main__':
    main()