#include <bits/stdc++.h>
#include <atcoder/all>	
using namespace std;
using namespace atcoder;
using ll = long long;

int main(){
	string s = "green", t = "difficult";
	int n;
	cin >> n;
	
	if(n < 1200) cout << s << endl;
	else cout << t << endl;
	
	
}