#include <iostream>
#include<fstream>
using namespace std;

ifstream fin("nim.in");
ofstream fout("nim.out");

int main()
{
    int t,n,x,s;
    fin>>t;
    while(t--)
    {
        fin>>n;
        s=0;
        while(n--)
        {
            fin>>x;
            s^=x;
        }
        fout<<(s!=0? "DA\n" : "NU\n");
    }
    fin.close();
    fout.close();
    return 0;
}