#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    string s;
    cin >> s;

    string ans;
    for(int i=0; i<s.length(); i++){
        ans += 'Z' - ('Z' - (s[i] - i - 1)) % 26;
    }

    cout << ans << endl;

    return 0;
}