#include <iostream>
#include <string>


using namespace std;
int main() {



  string s;
  cin >> s;
  int a = s.size();
  for (int i = 0; i < a; i++) {
    s[i] = (s[i] - 65 + 1039 - i) % 26 + 65;
  }
  cout << s << "\n";
  return 0;
}