#include <fstream>

using namespace std;

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

const int dim = (int) (1e5) + 1;
const int oo = (int) (1e9);

int n, v[dim], dp[dim], pr[dim], poz, l, a;

void cauta(int x)
{
    int st = 1;
    poz = 0;
    for(st; st < n; st<<=1);
    for(poz; st; st>>=1)
        if(poz + st <= n && dp[poz + st] < x)
            poz += st;
}

void afis(int p)
{
    if(pr[p] == 1)
    {
        out<<v[p]<<' ';
        return;
    }
    afis(pr[p]);
    out<<v[p]<<' ';
}

int main()
{
    in>>n;
    for(int i = 1; i <= n; i++)
    {
        in>>v[i];
        dp[i] = oo;
    }
    for(int i = 1;i <= n;i++)
    {
        cauta(v[i]);
        if(v[i] < dp[poz + 1])
        {
            dp[poz + 1] = v[i];
            pr[i] = poz + 1;
            a = i;
            if(poz + 1 > l)
                l = poz + 1;
        }
    }
    out<<l<<'\n';
    afis(a);
    return 0;
}