#include <iostream>
#include <iomanip>
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: admin
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/