#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
using namespace std;

int main(){
    string s,ans; cin >> s;
    rep(i,0,s.size()){
        ans = (((s[i]-'A')-(i+1)+1300)%26+'A');
        cout << ans;
    }
    cout << endl;
}