#include "bits/stdc++.h"
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;

using ll = long long;

int main() {
    string S;
    cin >> S;
    while (true) {
        if (S.substr(0, 2) != "AC") {
            cout << "Failed..." << endl;
            return 0;
        }
        S = S.substr(2);
        if (S.size() == 0) {
            cout << "Done!" << endl;
            return 0;
        }
        if (S[0] != ',') {
            cout << "Failed..." << endl;
            return 0;
        }
        S = S.substr(1);
    }
}