// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int main() {
	int t;
    cin >> t;
    while(t--) {
        int n;
        cin >> n;
        int s = 0;
        for(int i = 1; i <= n; i++) {
            int x;
            cin >> x;
            s ^= x;
        }
        if(s != 0) {
            cout << "DA\n";
        } else {
            cout << "NU\n";
        }
    }
}