#include<fstream>
#define lg 100001
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[lg],t[lg],x[lg],i,n,p,u,m,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;
    p=1;
    s=1;
    for(i=2;i<=n;i++)
    {
        p=1;
        u=s;
        while(p<=u)
        {
            m=(p+u)/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;
}