#include<fstream>
using namespace std;
#define MAX 100001
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int a[MAX],b[MAX],poz[MAX];
int n,m;

void citire()
{
    int i;
    cin>>n;
    for(i=1; i<=n; i++)
        cin>>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;
    cout<<m<<endl;
    for(i=b[m]; i>0; i=poz[i])
    cout<<a[i]<<' ';
}
int main()
{
    citire();
    subsir();
    tipar();
}