#include <iostream>
using namespace std;

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