# include <bits/stdc++.h>

using namespace std;

int n, T, x;

int main ()
{
    freopen("nim.in", "r", stdin);
    freopen("nim.out", "w", stdout);

    scanf("%d\n", &T);

    while (T--)
    {
        scanf("%d\n", &n);

        int xorsum = 0;

        for (int i = 1; i <= n; ++i)
        {
            scanf("%d ", &x);
            xorsum ^= x;
        }

        if (xorsum) printf("DA\n");
            else printf("NU\n");

    }

    return 0;
}