#include <bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define MAX 1000000
#define MOD 1000000009
//#define MOD 998244353
//#define INF 1000000000
#define INF 1000000000000000000

int main(){
  string s;
  cin>>s;
  for(int i=0;i<s.size();i++){
    int d=s[i]-'A';
    d+=26-(i+1)%26;
    d%=26;
    char c='A'+d;
    cout<<c;
  }
  cout<<endl;
}