#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    string s;
    cin >> n >> s;

    for (int i = 0; i < n; i++) {
        s[i] = 'z' - s[i] + 'a';
    }
    cout << s << endl;

    return 0;
}