#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,q,w,e;
	cin>>a>>b>>c;
	q=a*a;
	w=b*b;
	e=c*c;
	if((q-w)<e )
		cout<<" ";
	if((q+w)>e)	
		cout<<" ";

	if((q+w)<e)
		cout<<"no";
	if((q-w)>e)		
		cout<<"no";
	if((q+w)==e)  
		cout<<"zhijiao";
	if((q+w)<e )
	    cout<<"dunjiao";
	if((q+w)>e )
		cout<<"ruijiao";			   
	return 0;
}
/**************************************************************
	Problem: 1018
	User: cyp
	Language: C++
	Result: Wrong Answer
****************************************************************/