#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;


int main() {

    string S;
    cin >> S;
    bool ok = true;
    for (int i = 0; i < S.size(); i += 3) {
        if (S.substr(i, 2) != "AC") {
            ok = false;
            break;
        }
    }

    cout << (ok ? "Done!" : "Failed...") << endl;

    return 0;
}