#include<fstream>
#include<iostream>
using namespace std;

ifstream fin("scmax.in");
int n,m;
ofstream g("scmax.out");
int a[MAX],b[MAX],poz[MAX];
void citire()
{
    int i;
    fin>>n;
    for(i=1;i<=n;i++)
    fin>>a[i];
}

int caut(int p, int u, int x)
{
    int m;
    while(p<=u)
    {
        m=p+(u-p)/2;
        if(x<a[b[m]])
        p=m+1;
        else
        u=m-1;
    }
    return p;
}
void subsir()
{
    int i,j,k;
    a[0]=1234567890;
    for(i=n;i>=1;i--)
    {
        poz[i]=0;
        k=caut(1,m,a[i]);
        if(k>m)
        {
            poz[i]=b[k-1];
            m=k;
            b[k]=i;
        }
        else
        {
            poz[i]=b[k-1];
            if(a[b[k]]<a[i])
            b[k]=i;
        }
    }
}

void tipar()
{
    int i;
    g<<m<<'\n';
    for(i=b[m];i>0;i=poz[i])
        g<<a[i]<<' ';

}
int main()
{
    citire();
    subsir();
    tipar();
    fin.close();
    g.close();
    return 0;
}