#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<=c) cout<<"no"<<endl;
	else { 
		if(a*a+b*b==c*c) cout<<"zhijiao"<<endl;
		else if(a*a+b*b<c*c) cout<<"dunjiao"<<endl;
		else cout<<"ruijiao"<<endl;
	}
} 
/**************************************************************
	Problem: 1018
	User: xiaojingxuan
	Language: C++
	Result: Wrong Answer
****************************************************************/