#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#define all(x) (x).begin(),(x).end()
#define rep(i, n) for(int (i) = 0; i < (n); i++)
#define REP(i, m, n) for(int (i) = (m); (i) < (n); (i)++)
#define INF LLONG_MAX - 10
#define MOD 1000000007
#define fcout cout << fixed << setprecision(15)
#define int long long
#define yorn(f) puts((f)?"Yes":"No")
#define YORN(f) puts((f)?"YES":"NO")
typedef long long ll;
typedef pair<int, int> P;
typedef priority_queue<int> pque;
int gcd(int a,int b){return b?gcd(b,a%b):a;};
int lcm(int a,int b){return a*b/gcd(a,b);};
int mod(int a,int b){return (a+b-1)/b;};
int month[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
template<typename A, size_t N, typename T>
void Fill(A(&array)[N],const T &val){std::fill((T*)array,(T*)(array+N),val);}
template<class T>inline bool chmax(T& a,T b){if(a < b){a=b;return true;}return false;};
template<class T>inline bool chmin(T& a,T b){if(a > b){a=b;return true;}return false;};



signed main() {
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);

    string s;
    cin >> s;
    if((s.size() + 1) % 3 == 0 && find(all(s), 'W') == s.end()) {
        puts("Done!");
    } else {
        puts("failed...");
    }
 	return 0;
}