#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);
   //cout<<a<<b<<c;
	if(b+c<a){
		cout<<"no";
	}else{
	if(c*c+b*b==a*a) cout<<"zhijiao";
	if(c*c+b*b<a*a)cout<<"dunjiao";
	if(c*c+b*b>a*a)cout<<"ruijiao";
	
	}

	return 0;
}

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