#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<n; i++)
#define debug 0
#define YES cout << "Yes" << endl;
#define NO cout << "No" << endl;
using ll = long long;
using ld = long double;
const int mod = 998244353;
const int MOD = 1000000007;
const double pi = atan2(0, -1);
#include <time.h>
#include <chrono>

int main() {
	int N;
	cin >> N;
	if (N < 1200) {
		cout << "green" << endl;
	}
	else {
		cout << "difficult" << endl;
	}
}