#include <fstream>
#define w 100005
using namespace std;
unsigned int v[w];
unsigned int best[w];
unsigned int poz[w];
unsigned int bn(unsigned int x,unsigned int i, unsigned int j)
{
    unsigned int mid;
    while(i<=j)
    {
        mid=(i+j)/2;
        if (v[best[mid]]>x)
            i=mid+1;
        else
            j=mid-1;
    }
    return i;
}
int main()
{
    ifstream f("scmax.in");
    ofstream g("scmax.out");
    int i,n,j,m=0;
    f>>n;
    for (i=1;i<=n;i++)
        f>>v[i];
    for (i=n;i>=1;i--)
    {
        j=bn(v[i],1,m);
        if (j>m)
        {
            poz[i]=best[j-1];
            m=j;
            best[j]=i;
        }
        else
        {
            poz[i]=best[j-1];
            if (v[best[j]]<v[i]) best[j]=i;
        }
    }
    g<<m<<'\n';
    j=best[m];
    while (j!=0)
    {
        g<<v[j]<<' ';
        j=poz[j];
    }
    f.close();
    g.close();
    return 0;
}