#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
using ll = long long;
int ctoi(char c){return c-'0';}
ll ctoll(char c){return c-'0';}

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