#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(c+b<=a){
		cout<<"no";
	}else if(c*c+b*b==a*a){
		cout<<"zhijiao";
	}else if(c*c+b*b>a*a){
		cout<<"ruijiao";
	}else {
		cout<<"dunjiao";
	}
	return 0;
}
/**************************************************************
	Problem: 1018
	User: HUANGYIBO
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/