#include<fstream>

using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");

int k;
int n,a[100010];
int t[100010],d[100010];

void afisare(int x) {
	if (t[x]==0) cout<<a[x]<<" ";
	else {
		afisare(t[x]);
		cout<<a[x]<<" ";
	}
}

int main() { 
	cin>>n;
	for (int i=1; i<=n; i++) cin>>a[i];
	
	
	d[1]=1; k=1;
	for (int i=2; i<=n; i++) {
		
		int st=1, dr=k;	
		while (st<=dr) {
			
			int mid=(st+dr)/2;
			
			if (a[d[mid]]>=a[i]) dr=mid-1;
			else st=mid+1;
		}
		if (st==k+1) k++;
		d[st]=i;
		t[i]=d[st-1];
	}
	
	cout<<k<<'\n';
	afisare(d[k]);
	
	return 0;
}