#include <iostream>
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;
}