#include <bits/stdc++.h>
using namespace std;

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  string s;
  cin >> s;
  int n = s.size();
  string t = "AC";
  for (int _ = 0; _ < n / 3; ++_) {
    t += ",AC";
  }
  if (s == t) {
    cout << "Done!\n";
  } else {
    cout << "Failed...\n";
  }
}