#include <iostream>
#include <vector>
using namespace std;

vector<int> v;

int n, x;

int main()
{
    cin >> n;

    for (int i = 0; i < n; i++)
    {
        cin >> x;
        v.push_back(x);
    }

    int cnt = 0, candidate = 0;
    for (int i = 0; i < n; ++i)
    {
        if (cnt == 0)
        {
            candidate = v[i];
            cnt = 1;
        }
        else
        {
            if (v[i] == candidate)
                cnt++;
            else
                cnt--;
        }
    }

    cnt = 0;
    for (int i = 0; i < n; ++i)
    {
        if (v[i] == candidate)
            cnt++;
    }

    if (cnt > n / 2)
        cout << "DA " << candidate;

    else
        cout << "NU";

    return 0;
}