#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  string s;
  cin >> s;
  for (int i = 0; i < s.size(); ++i) {
    int diff = (i+1)%26;
    char c = (s[i]-'A' >= diff ? s[i]-diff : s[i] + 26 - diff);
    cout << c;
  }
  cout << endl;
  return 0;
}