#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,a,b) for(ll i=(ll)(a);i<(ll)(b);i++)
#define rrep(i,a,b) for(ll i=(ll)(a-1);i>=(ll)(b);i--)
#define MOD 998244353
//#define MOD 1000000007
#define INF 1e18
#define Pair pair<ll,ll>
//#define PI numbers::pi
//#define E numbers::e
template <typename T> bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template <typename T> bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
ll dx[8]={-2,-1,1,2,-2,-1,1,2};
ll dy[8]={-1,-2,-2,-1,1,2,2,1};

int main(){
    ll n; cin >> n;
    assert(1<=n&&n<=4000);
    if(n<1200) cout << "green" << endl;
    else cout << "difficult" << endl;
}