#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    string s; cin >> s;
    rep(i,s.size()){
        if(s[i] - (i+1)%26 >= 65) s[i] = s[i] - (i+1)%26;
        else s[i] = s[i] - (i+1)%26 + 26;
    }
    cout << s << endl;
}