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