#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,t;
    cin>>a>>b>>c;
    if(a>b){t=a;a=b;b=t;}
    if(b>c){t=b;b=c;c=t;}
    if(a+b>c&&a+c>b&&c+b>a)
        {if(b*b+a*a==c*c)cout<<"zhijiao";
        else if(b*b+a*a>c*c)cout<<"ruijiao";
            else cout<<"dunjiao";}
    else cout<<"no";
    return 0;
}
/**************************************************************
	Problem: 1018
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/