#include<bits/stdc++.h>
using namespace std;
long long INFl = 1LL<<60;
int INFi = 1<<30;
int AlphaNum = 26;
long long MOD = 998244353;
int mod(long long N){
    return (N + MOD ) % MOD;
}
long long my_pow(int a,int b){
    long long rec=1;
    for(int i=0;i<b;i++){
        rec *= a;
    }
    return rec;
}
int main(){
    int N;
    cin>>N;
    if(N<1200)cout<<"green"<<endl;
    else cout<<"difficult"<<endl;
    return 0;
}