#include <cstdio>

using namespace std;

FILE *f=fopen("scmax.in","r");
FILE *g=fopen("scmax.out","w");

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

void Read()
{
    fscanf(f,"%i",&n);
    for(int i=1;i<=n;i++)
        fscanf(f,"%i",&a[i]);
}

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

void Construct()
{
    int i=p;
    while(i!=-1)
    {
        fprintf(g,"%i ",a[i]);
        i=poz[i];
    }
}

int main()
{
    Read();
    Dinamic();
    fprintf(g,"%i\n",max);
    Construct();
    return 0;
}