#include <fstream>

using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int l[10001],a[10001];
long long mx,k,n;

void solve()
{
    int i,j;
    l[n]=1;
    for (i=n-1; i>=1; i--)
    {
        mx=0;
        for (j=i+1; j<=n; j++)
        {
            if (l[j]>mx&&a[i]<a[j])mx=l[j];
            l[i]=mx+1;
        }
    }
    mx=0;
    for (i=1; i<=n; i++)
    {
        if (l[i]>mx)
        {
            mx=l[i];
            k=i;
        }
    }
}




void afis()
{
    int i;
    g<<mx<<'\n';
    for (i=k; i<=n&&mx; i++)
    {
        if (l[i]==mx)
        {
            g<<a[i]<<" ";
            mx--;
        }
    }
}



int main()
{
    int i;
    f>>n;
    for (i=1; i<=n; i++)
    {
        f>>a[i];
    }
    solve();
    afis();
    return 0;
}