/* -*- coding: utf-8 -*-
 *
 * 2034.cc:  No.2034 Anti Lexicography - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

/* global variables */

char s[MAX_N + 4];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d%s", &n, s);

  for (int i = 0; i < n; i++) putchar('z' - (s[i] - 'a'));
  putchar('\n');
  return 0;
}