#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b<c||a+c<b||b+c<a) cout<<"no";
	else{
	if(a>b&&a>c&&c*c+b*b==a*a) cout<<"zhijiao";
	if(b>a&&b>c&&a*a+c*c==b*b) cout<<"zhijiao";
	if(c>a&&c>b&&a*a+b*b==c*c) cout<<"zhijiao";
	if(a>b&&a>c&&c*c+b*b<a*a) cout<<"dunjiao";
	if(b>a&&b>c&&a*a+c*c<b*b) cout<<"dunjiao";
	if(c>a&&c>b&&a*a+b*b<c*c) cout<<"dunjiao";
	if(a>b&&a>c&&c*c+b*b>a*a) cout<<"ruijiao";
	if(b>a&&b>c&&a*a+c*c>b*b) cout<<"ruijiao";
	if(c>a&&c>b&&a*a+b*b>c*c) cout<<"ruijiao";	
	}
	return 0;
}

/**************************************************************
	Problem: 1018
	User: panjinyan
	Language: C++
	Result: Wrong Answer
****************************************************************/