#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[100002],n,i,j,b[100002],c[100002],vmax,p;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>a[i];
    }
    for(i=n;1<=i;i--)
    {
        for(j=i+1;j<=n;j++)
        {
            if(a[i]<a[j]&&b[j]>vmax)
            {
                vmax=b[j];
                p=j;
            }
            b[i]=1+vmax;
            c[i]=p;
        }
    }
    vmax=b[1];
    p=1;
    for(i=2;i<=n;i++)
    {
        if(b[i]>vmax)
        {
            vmax=b[i];
            p=i;
        }
    }
    fout<<vmax<<"\n";
    for(i=p;i!=0;i=c[i])
    {
        fout<<a[i]<<" ";
    }
    fin.close();
    fout.close();
    return 0;
}