#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin() , v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)


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