#include<fstream>
using namespace std;
int a[10024],u,p,s,i,j,n,x[10024],t[10024],m;
ofstream g("scmax.out");
void afis(int k)
{
    if(k)
    {
        afis(t[k]);
        g<<a[k]<<" ";
    }
}
int main()
{
    ifstream f("scmax.in");
    f>>n;
    for(i=1;i<=n;i++)
    f>>a[i];
    x[1]=1;
    p=1;
    s=1;
    for(i=2;i<=n;i++)
    {
        p=1;
        u=s;
        while(p<=u)
        {
            m=(u+p)/2;
            if(a[i]>a[x[m]])
            p=m+1;
            else
            u=m-1;

        }
        if(p>s)
            s++;
            x[p]=i;
            t[i]=x[p-1];
    }
    g<<s<<"\n";
    afis(x[s]);
    return 0;
}