#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[100007],x[100007],p,n,j,i,t[100007],m,u,s;
void afis(int m)
{
    if(m)
    {
        afis(t[m]);
        g<<a[m]<<" ";
    }
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    f>>a[i];
    x[1]=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;
}