#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a<b)swap(a,b);
	if(a<c)swap(a,c);
	if(b<c)swap(b,c);
	if((b+c)<a){
		cout<<"no";
		return 0;
	}else {
		if(b*b+c*c==a*a)cout<<"zhijiao"; 
		else if(b*b+c*c<a*a)cout<<"dunjiao";
		else cout<<"ruijiao";  
	}	
	return 0;
}

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