#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(a+b>c){
		if(a*a+b*b==c*c) cout<<"zhijiao";
		else if(c*c+b*b<a*a) cout<<"ruijiao";
		else cout<<"dunjiao";
	}else cout<<"no";
	
	
	
	
	return 0;
	}

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