#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string s;
  cin >> s;
  string t;
  for (int i = 0; i < n; i++) {
    t += (char)('z' - (s[i] - 'a'));
  }
  cout << t << endl;
  return 0;
}