#include <fstream>
#include <algorithm>
#include <vector>
#define INF 1000000000
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");


int n,v[100001],ind[100001],p[100001];
int dp[100001];
int main()
{
	ios_base::sync_with_stdio(0);
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>v[i];
		dp[i]=INF;
	}
	for(int i=1;i<=n;i++)
	{
		int j=upper_bound(dp+1,dp+1+n,v[i])-dp;
		if(dp[j-1]<v[i] && v[i]<dp[j])
		{
			dp[j]=v[i];
			ind[j]=i;
			p[i]=ind[j-1];
		}
	}
	int ans=0;
	vector<int> rec;
	for(int i=1;i<=n;i++)
	{
		if(dp[i]<INF)
		{
			ans=i;
		}
	}
	cout<<ans<<'\n';
	int p1=ind[ans];
	while(p1!=0)
	{
		rec.push_back(v[p1]);
		p1=p[p1];
	}
	for(int i=rec.size()-1;i>=0;i--)
		cout<<rec[i]<<' ';
	return 0;
}