#include <iostream>

#include <iostream>
#include <vector>
#include <bits/stdc++.h>
#include <algorithm>
#include <bitset>
#include <string> 
using namespace std;
//https://shibh308.hatenablog.com/entry/2018/02/19/205716

typedef long long ll;
const int INF = 1e9;
const int MOD = 1e9+7;
const ll LINF = 1e18;
using namespace std;

#define dump(x)  cout << #x << " = " << (x) << endl;
#define YES(n) cout << ((n) ? "YES" : "NO"  ) << endl
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define POSSIBLE(n) cout << ((n) ? "POSSIBLE" : "IMPOSSIBLE"  ) << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible"  ) << endl

#define SANKOU(n,a,b) cout << ((n) ? (#a) : (#b) ) << endl

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)

#define FOREACH(x,a) for(auto& (x) : (a) )

#define SCOUT(x) cout<<(x)<<" "
#define ENDL cout<<endl

#define VECCIN(x) for(auto&youso_: (x) )cin>>youso_
#define VECCOUT(x) for(auto&youso_: (x) )cout<<youso_<<" ";cout<<endl

#define ALL(obj) (obj).begin(),(obj).end()

#define COUT(x) cout<<(x)<<endl
#define BOOLANS(x) if(x){cout << "Yes" << "\n";} else {cout << "No" << "\n";}
int main(){
  ll N ;
  cin >> N;
  if(N < 1200){
    cout << "green" << "\n";
  } else {
    cout << "difficult" << "\n";
  }
}