#include <bits/stdc++.h>
using namespace std;
int main() {
  map<char, char> mp;
  mp['A'] = 'Z';
  for (char c = 'B'; c <= 'Z'; c++) {
    mp[c] = c - 1;
  }
  string S;
  cin >> S;
  for (int i = 0; i < int(S.size()); i++) {
    for (int j = 0; j <= i; j++) {
      S[i] = mp[S[i]];
    }
  }
  cout << S << endl;
  return 0;
}