#include <iostream>
#include <fstream>
using namespace std;

long long n , x[100005] , best[100005]  , sir[100005] , poz;


int main ()
{
	ifstream f ("scmax.in");
	ofstream g ("scmax.out");
	
	long long max = 0;
	
	f >> n;
	
	for (long long i = 1 ; i <= n ; ++i)
		f >> x[i];
	
	
	for (long long i = 1 ; i <= n ; ++i)
	{
		long long maxx = 0;
		best[i] = 0;
		
		for (long long j = 1 ; j < i ; ++j)
			if (x[j] < x[i] && best[j] > maxx)
			{
				maxx = best[j];
				sir[maxx] = x[j];
			}
		
		best[i] = maxx + 1;	
		
		sir[maxx + 1] = x[i];
		
		if (best[i] > max)
			max = best[i];
	}
	
	g << max << "\n";
	
	for (long long i = 1 ; i <= max ; ++i)
		g << sir[i] << " ";
	
	g << "\n";
	
	return 0;
}