#include <iostream>
using namespace std;

int main(void) {
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	string s;
	cin >> s;
	char c;
	bool ok = true;
	for (int i = 1; i < s.size(); i += 3) {
		if (s[i - 1] != 'A' || s[i] != 'C') {
			ok = false;
			break;
		}
	}
	cout << (ok ? "Done!" : "Failed...");
	return 0;
}