#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
long long a[100001],x[100001],i,n,st,dr,s,mij,j;
int main()
{
	f>>n;
	for(i=1;i<=n;i++)
		f>>a[i];
	x[1]=1;
	s=1;
	st=1;
	for(i=2;i<=n;i++)
	{
		st=1;
		dr=s;
		while(st<=dr)
		{
			mij=(st+dr)/2;
			if(a[i]>a[x[mij]])
				st=mij+1;
			else
				dr=mij-1;
		}
		if(st>s)
			s++;
		x[s]=i;
	}
	g<<s<<"\n";
		for(j=1;j<=s;j++)
			g<<a[x[j]]<<" ";
		return 0;
}