#include<bits/stdc++.h>
using namespace std;
int main() { 
	int a,b,c,t;
	cin>>a>>b>>c;
	if (a>b) {
    swap(a,b);
	}
  	if (a>c) {
    	swap(a,c);
	}
	if (b>c) {
    	swap(b,c);
	}
    if (a+b>c){
    	if(a*a+b*b==c*c)    cout<<"zhijiao";  
  		else if (a*a+b*b<c*c) cout<<"dunjiao";
  		else cout<<"ruijiao";
  	}else cout<<"no";
    return 0;
}
/**************************************************************
	Problem: 1018
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/