#include <bits/stdc++.h>
//#include<atcoder/all>
using namespace std;
//using namespace atcoder;
using ll = long long;
const ll mod = 1000000007;
//const ll mod = 998244353;
int main() {
	int n;
	cin >> n;
	if (n < 1200)cout << "green" << endl;
	else cout << "difficult" << endl;
}