/**
 * @file 2557.cpp
 * @brief yukicoder problem 2557
 * @author Keitaro Naruse
 * @date 2023-12-02
 * @copyright MIT License
 * @details https://yukicoder.me/problems/no/2557
 * */

// # Solution

#include <iostream>
#include <string>
#include <vector>

template < class T >
std::ostream& operator<<( std::ostream& os, const std::vector< T >& v ) {
    for( auto it = v.begin( ); it != v.end( ); it++ ) {
        os << *it << ( it == --v.end( ) ? "" : " " );
    }
    return os;
}

int main( ) {
    //  Read N = [ 1, 4*10^3 ]
    int N;
    std::cin >> N;

    //  Main::Preprocess
    //  Main::Find a solution
    bool is_yes = true;
    std::string answer = ( N < 1200 ) ? "green" : "difficult";
    //  Main::Output a solution
    std::cout << answer << std::endl;
    
    //  Finalize
    return 0;
}