#include <bits/stdc++.h>
#if __has_include("./debug.cpp")
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

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