#include <fstream>
using namespace std;
int n,i,j,l,k,a[100001],m[100001],b[100001];
int main(){
	ifstream f("scmax.in");
	ofstream g("scmax.out");
	f>>n;
	for (i=1;i<=n;i++){
		f>>a[i];
		m[i]=1;
		for (j=i-1;j>=1;j--)
			if (a[j]<a[i]&&m[j]>=m[i])
				m[i]=m[j]+1;
		if (m[i]>l)
			l=m[i];
	}
	g<<l<<'\n';
	k=l;
	for (i=n;i>=1;i--)
		if (m[i]==l){
			b[l]=a[i];
			l--;}
	for (i=1;i<=k;i++) 
		g<<b[i]<<' ';
	return 0;}