#include <fstream>

using namespace std;

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

int n, i, j, st, dr, m, poz;
int a[100005], b[100005], c[100005], k;
int sol[100005];

int main()
{
    f >> n;
    for (i = 1; i <= n; i++)
        f >> a[i];
    for (i = 1; i <= n; i++)
        if (a[i] > b[k])
            k++, b[k] = a[i], c[i] = k;
        else
        {
            st = 1, dr = k, poz = k;
            while (st <= dr)
            {
                m = (st+dr)/2;
                if (b[m] > a[i])
                    st = m+1;
                else
                    dr = m-1, poz = m;
            }

            b[poz] = a[i];
            c[i] = poz;
        }
    for (i = n; i > 0; i--)
        if (c[i] == k)
            j++, sol[j] = a[i], k--;
    g << j << '\n';
    for (i = j; i >= 1; i--)
        g << sol[i] << ' ';
    return 0;
}