#include<bits/stdc++.h>
using namespace std; 
int main(){
	int a,b,c;
	scanf("%d %d %d",&a,&b,&c);
		
	int arr[] = {a,b,c};
	std::sort(arr,arr+3);	
	a=arr[0];
	b=arr[1];
	c=arr[2];
	if(a+b<=c){
		printf("no\n");	
	}else{
		long long a2=(long long)a*a;
		long long b2=(long long)b*b;
		long long c2=(long long)c*c;
	 	if(a2+b2==c2){
	 		printf("zhijiao\n");	
	 	}else if(a2+b2==c2){
	 		printf("ruijiao\n");
	 	}else{
	 		printf("dunjiao\n");
	 	}
	}
	
	return 0;
}
	
/**************************************************************
	Problem: 1018
	User: huanghao
	Language: C++
	Result: Wrong Answer
****************************************************************/