#include<bits/stdc++.h>
using namespace std;
int main(){
   int n,x,s;
   cin>>n>>x>>s;
   if(n+x==s||x+s==n||n+s==x) cout<<"zhijiao";
   if(n+x>s||x+s>n||n+s>x) cout<<"ruijiao";
   if(n+x<s||x+s<n||n+s<x) cout<<"dunjiao";
	return 0;
}

/**************************************************************
	Problem: 1018
	User: duyahan
	Language: C++
	Result: Wrong Answer
****************************************************************/