#include <iostream>
#include <string>
using namespace std;

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