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

int main() {
  string s, t;
  cin >> s;
  for (size_t i = 0; i < s.length(); i++) {
    char c = s[i] - (i + 1) % 26;
    if (c >= 'A') t += c;
    else t += ('Z' + 1) - ('A' - c);
  }
  cout << t << endl;
}