#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a<b) swap(a,b);
    if(a<c) swap(a,c);
    if(b<c) swap(b,c);
   //cout<<a<<b<<c;
    if(b+c>a){
        if(c*c+b*b==a*a) cout<<"zhijiao";
        if(c*c+b*b<a*a)cout<<"dunjiao";
        if(c*c+b*b>a*a)cout<<"ruijiao";
    }else{
     
    cout<<"no";
    }
 
    return 0;
}
/**************************************************************
	Problem: 1018
	User: laichenxu
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/