#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int main()
{
    int a[100002],b[100002],i,j,n,k;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>a[i];
        b[i]=1;
    }
    int lmax=1;
    for(i=n-1;i>0;i--)
    {
        for(j=i+1;j<=n;j++)
        {
            if(a[i]<a[j]&&b[i]<b[j]+1)
            {
                b[i]=b[j]+1;
                if(lmax<b[i]+1)
                    lmax=b[i];
            }
        }
    }
    g<<lmax<<endl;
    for(i=1;i<=n;i++)
    {
        if(b[i]==lmax)
        {
            g<<a[i]<<" ";
            lmax--;
        }

    }
    return 0;
}