#include <cstdio>

using namespace std;

int n, a[10000], l[10000], p[10000], max, poz;

void citire()
{
    scanf ("%d\n",&n);
    for (int i=0; i<n; i++)
    {
        scanf ("%d ",&a[i]);
        l[i]=1;
        p[i]=-1;
    }
}

void sir()
{
    for (int i=n-1; i>=0; i--)
        for (int j=i+1; j<n; j++)
            if (a[j]>a[i] && l[i]<l[j]+1)
            {
                l[i]=1+l[j];
                p[i]=j;
                if (l[i]>max)
                    max=l[i];
            }
}

void afisare()
{
    printf ("%d\n",max);
    for (int i=0; i<n; i++)
        if (l[i]==max)
        {
            poz=i;
            while (p[poz])
            {
                printf ("%d ", a[poz]);
                poz=p[poz];
                if (p[poz]==-1)
                {
                    printf ("%d ",a[poz]);
                    break;
                }
            }
        }
    printf ("\n");
}

int main()
{
    freopen ("scmax.in","r",stdin);
    freopen ("scmax.out","w",stdout);
    citire();
    sir();
    afisare();
    return 0;
}