#include <iostream>
using namespace std;

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