#include <fstream>
#define N 100010
using namespace std;

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

int n, mini, poz, v[N], s[N], p[N];
bool ok;

void afis(int mini2, int n)
{
    int i;
    for(i = 1; i <= n; ++i)
        if(p[i] == mini2)
            break;
    mini2--;
    if (mini2) afis(mini2, i);
    g << v[i] << " ";
}

int main()
{
    f >> n;
    for (int i = 1; i <= n; ++i)
        f >> v[i];

    s[1] = v[n];
    p[1] = 1;
    mini = 1;

    for (int i = n; i >= 1; --i)
    {
        poz = 0;
        ok = 0;
        for (int j = mini; j >= 1  && !ok; --j)
            if (s[j] <= v[i])
            {
                ok = 1;
                poz = j;
            }
        if (ok)
        {
            s[poz] = v[i];
            p[i] = poz;
        }
        else
        {
            mini++;
            s[mini] = v[i];
            p[i] = mini;
        }
    }
    g << mini << endl;
    afis (mini, n);
    return 0;
}