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

/**************************************************************
	Problem: 1018
	User: ccf
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/