#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[100008],x[100008],p,n,j,i,t[10008],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;
}