#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);
    }
    if(c+b<=a){
        cout<<"no";
    }else if(c*c+b*b==a*a){
        cout<<"zhijiao";
    }else if(c*c+b*b>a*a){
        cout<<"ruijiao";
    }else {
        cout<<"dunjiao";
    }
    return 0;
}
/**************************************************************
	Problem: 1018
	User: 12345678
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2072 kb
****************************************************************/