#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

int main() {
  string s, ans;
  cin >> s;
  rep(i, 0, s.size()) {
    // A=65
    int chk = s[i] - ((i + 1) % 26);
    if (chk < 'A') {
      chk += 26;
    }
    ans += chk;
  }
  cout << ans << endl;
  getchar();
}