import java.util.*;
import java.io.*;
class Main{
	private static final BufferedReader br =
		new BufferedReader(new InputStreamReader(System.in));
	private static final PrintWriter out =
		new PrintWriter(System.out);
	public static void main(String[] args)throws IOException{

		int N = Integer.parseInt(br.readLine());
		out.println(N<1200?"green":"difficult");

		br.close();
		out.close();
	}
}