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

int main(){
  string S;
  cin >> S;
  for(int i=0;i<S.size();i++){
    int t = i+1;
    t %= 26;
    t = 26-t;
    int a = S[i]-'A';
    a += t;
    a %= 26;
    S[i] = 'A'+a;
  }
  cout << S << endl;
}