#include <fstream>
using namespace std;
ifstream fin("nim.in");
ofstream fout("nim.out");
int n,i,t,x,s;
int main(){
    fin>>t;
    while(t--){
        fin>>n;
        s=0;
        for(i=1;i<=n;i++){
            fin>>x;
            s^=x;
        }
        if(s){
            fout<<"DA"<<"\n";
        }
        else{
            fout<<"NU"<<"\n";
        }
    }


    return 0;
}