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

int main()
{
    string S;
    cin >> S;
    for (size_t i = 0; i < S.size(); ++i)
    {
        S[i]=((S[i]-='A')-(i+1)+1040)%26+'A';

        cout << (S[i]) << endl;
    }
}