#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < n; ++i)
using ll = long long;
using P = pair<int,int>;
const int alp=26;
int main() {
   string s;cin>>s;
   for (int i = 1; i <= s.size(); i++){
      cout<<char((s[i-1]-'A'+i*(alp-1))%alp+'A');
   }
   cout<<endl;
}