#include <iostream>

using namespace std;
unsigned int n,ap,v[100001],i,m;
int main()
{
   cin>>n>>v[1];
   m=v[1];ap=1;
   for(i=2;i<=n;i++)
   {
       cin>>v[i];
       if(ap==0)
       {
           m=v[i];
           ap=1;
       }
       else if(v[i]==m)
        ap++;
       else ap--;
   }
   ap=0;
   for(i=1;i<=n;i++)
   {
       if(v[i]==m)
        ap++;
        if(ap>n/2)
        {
            cout<<"DA "<<m;
            return 0;
        }
   }

    cout<<"NU";
}