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

int main()
{
	string S;
	cin >> S;


	string ans = "Done!";
	for( int i = 0; i < S.size(); i++ ) {
		if( S[i] == 'A' && S[i + 1] == 'C' ) i += 2;
		else {
			ans = "Failed...";
			break;
		}
	}

	cout << ans << endl;
}