#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i++) {
        int c = (i + 1) % 26;
        if (s.at(i) - c < 'A') {
            cout << char('Z' - ('A' - (s.at(i) - c + 1)));
        } else {
            cout << char(s.at(i) - c);
        }
    }
    cout << endl;
    return 0;
}