#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef pair<int,int> P;

int main(){
  string s;
  cin >> s;
  int n = sz(s);
  rep(i,n) {
    if (i == 0 || s[i-1] == ',') {
    if (s.substr(i,2) != "AC") {
      cout << "Failed..." << endl;
      return 0;
    }
    }
  }
  cout << "Done!" << endl;
  return 0;
}