#include <bits/stdc++.h>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int v[100002], n, a[100002], p[100002], ta, af[100002], tf;
int main()
{
    f >> n;
    for (int i = 1; i <= n; i++)
    {
        f >> v[i];
        if (!ta || a[ta] < v[i])
            a[++ta] = v[i], p[i] = ta;
        else
        {
            int st = 1, dr = ta, r = 0;
            while (st <= dr)
            {
                int mid = (st + dr) / 2;
                if (a[mid] >= v[i])
                    r = mid, dr = mid - 1;
                else
                    st = mid + 1;
            }
            if (r)
                a[r] = v[i],
                p[i] = r;
        }
    }
    g << ta << '\n';
    for (int i = n; i >= 1 && ta; i--)
        if (p[i] == ta)
            af[++tf] = v[i], ta--;
    for (int i = tf; i >= 1; i--)
        g << af[i] << " ";
    return 0;
}