#include<bits/stdc++.h>
using namespace std;
int main()
{
int a,b,c,t;
cin>>a>>b>>c;
if(a>b){

t=a;
a=t;
b=t;
}

if(a>c){
a=t;
a=c;
c=t;
}

if(b>c){
t=b;
b=c;
c=t;
}
if(a+b>c){
	if(a*a+b*b==c*c) cout<<"zhijiao";
	if(a*a+b*b<c*c) cout<<"dunjiao";
	if(a*a+b*b>c*c) cout<<"ruijiao";
}
else cout<<"no";

	return 0;
}

/**************************************************************
	Problem: 1018
	User: hbq
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/