#include <bits/stdc++.h>
using namespace std;

int mod(int x, int y)
{
    int n = x % y;
    return n + (n < 0) * y;
}

int main()
{
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i++)
    {
        int n = s[i];
        n -= ('A' + i + 1);
        char c = mod(n, 26) + 'A';
        cout << c;
    }
    //system("pause");
}