#include <cstdio>
        using namespace std;
        int main()
        {
            int n, t, i, j, x, sum;
            freopen("nim.in","r",stdin);
            freopen("nim.out","w",stdout);
            scanf("%d",&t);
            for (i=1; i<=t; i++)
            {
                scanf("%d",&n);
                sum=0;
                for (j=1; j<=n; j++)
                {
                    scanf("%d",&x);
                    sum=sum^x;
                }
                if (sum!=0) printf("DA\n");
                else printf("NU\n");
            }
            fclose(stdin);
            fclose(stdout);
            return 0;
        }