#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <fstream>
#include <cmath>
#include <stack>
#include <queue>
#include <iomanip>
using namespace std;

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