#include <fstream>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");
long long n, v[100005], aux[100005], maxim, rez[100005], c;
int main()
{
    cin >> n;
    for (int i = 1; i <= n; ++i)
        cin >> v[i], aux[i] = 1;
    for (int i = 2; i <= n; ++i)
        for (int j = 1; j < i; ++j)
            if (v[i] > v[j] && aux[i] < aux[j] + 1)
                aux[i] = aux[j] + 1;
    for (int i = 1; i <= n; ++i)
        if (aux[i] > maxim)
            maxim = aux[i];
    cout << maxim << "\n";
    c = maxim;
    for (int j = n; j >= 1; --j)
        if (aux[j] == maxim)
            rez[maxim] = v[j], --maxim;
    for (int i = 1; i <= c; ++i)
        cout << rez[i] << " ";
    return 0;
}