#include <fstream>

using namespace std;

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

int t, n, a, x;

int main()
{
	fin >> t;
	while (t--)
	{
		x = 0;
		fin >> n;
		while (n--)
		{
			fin >> a;
			x ^= a;
		}
		if (x)
			fout << "DA\n";
		else fout << "NU\n";
	}
	return 0;
}