#include <iostream>
#include <string>
using namespace std;

int main(){
    string s;
    cin >> s;

    for(int i = 0; i < s.size(); i++){
        s[i] -= i + 1;
        if(s[i] < 'A'){
            s[i] = 'Z';
        }
    }

    cout << s << endl;;
}