#include <fstream>
#include <vector>

using namespace std;

void refac_subsirul(ofstream &out, vector <int> &v, vector <int> &lung, int p, int lg, int val)
{
    ///cautam incepand la stanga poz. p elem. <= val, cu subsirul de lungime lg
    if (p < 0)
    {
        return;
    }
    if (v[p] <= val && lung[p] == lg)
    {
        refac_subsirul(out, v, lung, p - 1, lg - 1, v[p] - 1);
        out << v[p] << " ";
    }
    else
    {
        refac_subsirul(out, v, lung, p - 1, lg, val);
    }
}

int main()
{
    ifstream in("scmax.in");
    ofstream out("scmax.out");
    int n, ultimul = 0;
    in >> n;
    vector <int> v(n), lung(n);
    for (int i = 0; i < n; i++)
    {
        in >> v[i];
        int lmax_i = 0;
        for (int j = 0; j < i; j++)
        {
            if (v[j] < v[i])
            {
                lmax_i = max(lmax_i, lung[j]);
            }
        }
        lung[i] = 1 + lmax_i;
        if (lung[i] > lung[ultimul])
        {
            ultimul = i;
        }
    }
    out << lung[ultimul] << "\n";
    refac_subsirul(out, v, lung, ultimul, lung[ultimul], v[ultimul]);
    in.close();
    out.close();
    return 0;
}