#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;

using lint = long long;
using mint = atcoder::modint;

int main() {
    string s;
    cin >> s;
    mint::set_mod(26);
    rep(i, (int)s.size()) {
        mint x = mint(s[i] - 'A');
        x -= mint(i + 1);
        s[i] = (char)(x.val() + 'A');
    }
    cout << s << endl;
}