#include <bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,t;
	cin>>a>>b>>c;
	
	if(a>b){
		t=a;
		a=b;
		b=t;
	}
	
	if(a>c){
		t=a;
		a=c;
		c=t;
	}

	if(b>c){
		t=b;
		b=c;
		c=t;
	}
	// 
	if(a+b>c){
		if(a*a+b*b==c*c){//直角三角形 
			cout<<"zhijiao"<<endl;
		}else if(a*a+b*b>c*c){//锐角三角形 
			cout<<"ruijiao"<<endl;
		}else if(a*a+b*b<c*c){//钝角三角形 
			cout<<"dunjiao"<<endl;
		}
	}else{
		cout<<"no"<<endl;
	}
	return 0;
}

/**************************************************************
	Problem: 1018
	User: Liulaoshi
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/