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

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

    int N = s.size();
    string result(s);

    for(int i=0;i<N;++i){
        result[i] =  (s[i] - ((i+1) % 26));
        if(result[i] < 'A'){
            result[i] = 'Z' - ('A' - result[i]) + 1;
        }
    }
    cout << result << endl;
    return 0;
}