#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: chenlingxuan
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/