#include<iostream>
#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
vector <int> a,l;
vector <int> ::iterator it;
int n,x,i;
int main()
{
	freopen("scmax.in","r",stdin);
	freopen("scmax.out","w",stdout);
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d",&x);
		it=lower_bound(a.begin(),a.end(),x);
		if(it!=a.end())
		{
			*it=x;
			l.push_back(it-a.begin()+1);
		}
		else
		{
			a.push_back(x);
			l.push_back(a.size());
		}
	}
	printf("%d\n",a.size());
	for(it=a.begin();it!=a.end();it++)
		printf("%d ",*it);
	printf("\n");
	return 0;
}