#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,a) for(int i = 0; i < (a); ++i)

template<typename T> bool chmax(T &a,T b){if(a<b){a=b; return true;} return false;}
template<typename T> bool chmin(T &a,T b){if(a>b){a=b; return true;} return false;}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

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