#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<c){
		cout<<"no";
	}
	if(a*a+b*b==c*c){
		cout<<"zhijiao";
	}
	if(a*a+b*b<c*c){
		cout<<"dunjiao";
	}
	if(a*a+b*b>c*c){
		cout<<"ruijiao";
	}
	return 0;
}
/**************************************************************
	Problem: 1018
	User: zhangailin
	Language: C++
	Result: Wrong Answer
****************************************************************/