#include <iostream>
using namespace std;
int main(){
  string s;
  cin >> s;
  for(int i = 0; s.size() > i; i++){
    int tmp = s[i] - (i + 1);
    while(tmp < 65){
      tmp += 26;
    }
    s[i] = tmp;
  }
  cout << s << endl;
  return 0;
}