#include <fstream>
#include <climits>

using namespace std;

const int N = 1e5;

ifstream in("scmax.in");
ofstream out("scmax.out");

int x[N], lung[N];

void refac_subsirul(int p, int lungime, int val_min)
{
    if (lungime == 0)
    {
        return;
    }
    if (lung[p] == lungime && x[p] < val_min)
    {
        refac_subsirul(p - 1, lungime - 1, x[p]);
        out << x[p] << " ";
    }
    else
    {
        refac_subsirul(p - 1, lungime, val_min);
    }
}

int main()
{
    int n;
    in >> n;
    int i_max = 0;
    for (int i = 0; i < n; i++)
    {
        in >> x[i];
        int l_max_i = 0;
        for (int j = 0; j < i; j++)
        {
            if (x[j] < x[i])
            {
                l_max_i = max(l_max_i, lung[j]);
            }
        }
        lung[i] = 1 + l_max_i;
        if (lung[i] > lung[i_max])
        {
            i_max = i;
        }
    }
    out << lung[i_max] << "\n";
    refac_subsirul(i_max, lung[i_max], INT_MAX);
    in.close();
    out.close();
    return 0;
}