#include <fstream>
#define NMAX 100001
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[NMAX],best[NMAX],poz[NMAX],n,sol[NMAX],pozcrt=1;
void citire();
int cautare(int x);
int main()
{
    int i,st,dr,mijl,x,aux;
    citire();
    for (i=1; i<=n; i++)
    {
        if (a[i]>best[pozcrt-1])
        {
            best[pozcrt]=a[i];
            poz[i]=pozcrt++;
        }
        else
        {
            aux=cautare(a[i]);
            best[aux]=a[i];
            poz[i]=aux;
        }
    }
    x=pozcrt;
    fout<<pozcrt-1<<'\n';
    for (i=n; i>=1; i--)
    {
        if (poz[i]==pozcrt-1) sol[pozcrt--]=a[i];
    }
    for (i=2; i<=x; i++) fout<<sol[i]<<' ';
    return 0;
}
void citire()
{
    int i;
    fin>>n;
    for (i=1; i<=n; i++) fin>>a[i];
}
int cautare(int x)
{
    int st,dr,mijl;
    st=1; dr=pozcrt-1;
    while (st<=dr)
    {
        mijl=(st+dr)/2;
        if (best[mijl]<x) st=mijl+1;
        else dr=mijl-1;
    }
    return st;
}