#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;

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

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