#include <iostream>
#include <fstream>

using namespace std;

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

const int NMAX=100003;

int N, v[NMAX], best[NMAX], ult[NMAX], maxim, k, sir[NMAX], nr;

void afis(int i)
{

}

int caut(int x)
{
    int p, u, m;
    p = 0;
    u = nr;
    m = (p+u)/2;
    while (p <= u)
    {
        if (v[sir[m]] < x &&  v[sir[m+1]] >= x)
            return m;
        else if (v[sir[m+1]] < x)
        {
            p = m + 1;
            m = (p + u)/2;
        }
        else
        {
            u = m - 1;
            m = (p + u)/2;
        }
    }
    return nr;
}

int main()
{
    int i, j, poz;
    nr = 1;
    f>>N;
    for (i = 1; i <= N; i++)
        f>>v[i];
    best[1] = sir[1] = 1;
    sir[0] =  0;
    for (i = 2; i <= N; i++)
    {
        poz = caut(v[i]);
        ult[i] = sir[poz];
        best[i] = poz + 1;
        sir[poz + 1] = i;
        if (nr < poz + 1)
            nr = poz + 1;
    }
    maxim = best[1];
    for (i = 2; i <= N; i++)
        maxim=max(maxim,best[i]);
    g<<maxim<<endl;
    for(i=1; i<=maxim; i++)
        g<<v[sir[i]]<<' ';
    return 0;
}