#include <iostream>
#include <fstream>
using namespace std;
ifstream f("nim.in");
ofstream g("nim.out");
int t,n,i,j,x,s;
int main()
{
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>n;
        s=0;
        for(j=1;j<=n;j++)
            {
                f>>x;
                s^=x;
            }
        if(s)g<<"DA\n";
        else g<<"NU\n";
    }
    return 0;
}