#include<fstream>
using namespace std;
#define nmax 100010
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;
}