#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); i++)
template<typename T> inline bool chmax(T &a, T b) {return ((a < b) ? (a = b, true) : (false));}
template<typename T> inline bool chmin(T &a, T b) {return ((a > b) ? (a = b, true) : (false));}
typedef long long ll;
typedef pair<ll,ll> P;



int main() {
    int n;
    cin >> n;

    if(n < 1200) {
        cout << "green" << endl;
    }
    else {
        cout << "difficult" << endl;
    }


    return 0;
}