#include <iostream>
#include <string>
#include <cmath>
using namespace std;

char decorder(char c, int shift) {
    int num_of_A = 'A';
    
    while (c - fmod(shift, 26) < num_of_A) {
        shift -= 26;
    }
    
    return c - fmod(shift, 26);
}

int main() {
    string uhsah;
    cin >> uhsah;
    
    for (int c=0; c < uhsah.size(); ++c) {
        cout << decorder(uhsah[c], c+1);
    }
    
    cout << endl;
}