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

int main() {
	int i;
	string s;
	cin >> s;
	i=0;
	while(i<s.size()){
		if(s[i]=='A' && s[i+1]=='C'){
			i+=3;
		}else{
			cout << "Failed..." << endl; return 0;
		}
	}
	cout << "Done!" << endl;
	return 0;
}