#include <fstream>
#include <vector>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, i, j, k, x[100001], v[100001], l[100001];
int main()
{
    fin >> n;
    for (i = 1; i <= n; i++)
        fin >> x[i];
    for (i = 1; i <= n; i++)
    {
        if (x[i] > v[k]) v[++k] = x[i], l[i] = k;
        else
        {
            int st = 1, dr = k, poz = k, m;
            while (st <= dr)
            {
                m = (st+dr)/2;
                if (x[i] > v[m])
                    st = m+1;
                else poz = m, dr = m-1;
            }
            v[poz] = x[i], l[i] = poz;
        }
    }
    fout << k << '\n';
    for (i = n; i > 0 && k > 0; i--)
        if (l[i] == k) v[++j] = x[i], --k;
    for (i = j; i > 0; i--)
        fout << v[i] << ' ';
    return 0;
}