#include <bits/stdc++.h>
using namespace std;

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