#pragma GCC optimize("Ofast")
#include <iostream>
using namespace std;

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  string S;
  cin >> S;
  const int gap = 'Z' - 'A' + 1;
  for (int i = 0; i < (int)S.size(); i++) {
    int x = i + 1;
    x %= gap;
    S[i] = S[i] - x;
    if (S[i] < 'A') {
      S[i] = 'Z' - ('A' - S[i] - 1);
    }
  }
  cout << S << endl;
  return 0;
}