#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&b+c>a&&c+a>b){
		if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a){
			cout<<"zhijiao";
		}else if(a*a+b*b<c*c||a*a+c*c<b*b||b*b+c*c<a*a){
			cout<<"dunjiao";
		}else{
			cout<<"ruijiao";
		} 
			
	}else{
		cout<<"no";
	}
}
/**************************************************************
	Problem: 1018
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/