#include <iostream>
using namespace std;

#define SPREAD_SIZE 97

struct dat {
    int n;
    int c;
};

dat v[SPREAD_SIZE][10005];

int main(){
    int n, x, i, x_hash, n_cp2;
    int max_nr = -1, max_c = 0;
    int last_index;

    cin>>n;
    n_cp2 = n / 2;

    for(i = 0; i < SPREAD_SIZE; i++) v[i][0].n = 1;

    while(n--){
        cin>>x;
        x_hash = x % SPREAD_SIZE;

        last_index = 0;
        for(i = 1; i <= v[x_hash][0].n; i++){
            if(v[x_hash][i].n == x){
                v[x_hash][i].c ++;
                last_index = i;
                break;
            }
        }
        if(!last_index){
            last_index = v[x_hash][0].n;
            v[x_hash][last_index].n = x;
            v[x_hash][last_index].c = 1;
            v[x_hash][0].n ++;
        }

        if(v[x_hash][last_index].c > max_c){
            max_c = v[x_hash][last_index].c;
            max_nr = v[x_hash][last_index].n;
        }

        if(max_c >= n_cp2) break;
    }

    if(max_c >= n_cp2) {
        cout<<"DA "<<max_nr;
    }
    else {
        cout<<"NU";
    }
}