#include <stdio.h>

using namespace std;

int main(){
    freopen("nim.in", "r", stdin);
    freopen("nim.out", "w", stdout);
    int t, n, x, sum = 0;
    scanf("%d", &t);
    while(t--){
        scanf("%d", &n);
        for(int i = 1; i <= n; ++i){
            scanf("%d", &x);
            sum ^= x;
        }
        if(sum == 0)
            printf("NU\n");
        else
            printf("DA\n");
    }
    return 0;
}