// I SELL YOU...! 
#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
signed main(){
  string s;
  cin >> s;
  for(int i=0;i<s.size();){
    if(s[i]=='A'&&s[i+1]=='C'){
      i+=3;
    }else{
      cout <<"Failed...\n";
      return 0;
    }
  }
  cout << "Done!\n";
}