#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<ll,ll> P;
typedef modint998244353 mint;
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,a,b) for(ll i=a;i>=b;i--)
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(0);
    string s;
    cin>>s;
    rep(i,0,s.size()-1){
        if(s[i]=='A'&&s[i+1]=='C'){
            i++;
        }else if(s[i]==','){

        }else{
            cout<<"Failed..."<<endl;
            return 0;
        }
    }
    cout<<"Done!"<<endl;

}