#include <iostream>
#include <string>
using namespace std;
int main() {
    string s, an = "";
    int i, qt;
    cin >> s;
    for (i = 0; i < s.length(); i++) {
        qt = s[i];
        qt -= i + 1;
        while (qt < 65) {
            qt += 26;
        }
        an += qt;
    }
    cout << an << endl;
    return 0;
}