#include<fstream>
#define nmax 100010

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");
int n,k,a[nmax],sol[nmax],L[nmax],poz;


int main()
{
    int i,j,l,r,m;
    f>>n;
    for (i=1; i<=n; ++i)
        f>>a[i];
    sol[++k]=a[1];
    L[1]=1;
    for (i=2; i<=n; ++i)
    {
        l=1;
        r=k;
        poz=k+1;
        while (l<=r)
        {
            m=(l+r)/2;
            if (a[i]<=sol[m]) poz=m, r=m-1;
            else l=m+1;
        }
        if (poz<=k) sol[poz]=a[i], L[i]=poz;
        else sol[++k]=a[i], L[i]=k;
    }
    g<<k<<'\n';
    j=k;
    for (i=n; i>0; --i)
        if (L[i]==k) sol[k]=a[i], --k;
    for (i=1; i<=j; ++i)
        g<<sol[i]<<' ';
    g<<'\n';
    return 0;
}