#include<iostream>
#include<fstream>
using namespace std;
int v[100001],l[100001],p[100001],a[100001],nr;
ofstream g("scmax.out");
int cautarebinara(int x)
{
   int p, u, m;
   p = 0; u = nr; m = (p+u)/2;
   while (p <= u)
   {
      if (v[l[m]] < x &&  v[l[m+1]] >= x) return m;
      else if (v[l[m+1]] < x) {p = m + 1; m = (p + u)/2;}
      else {u = m - 1; m = (p + u)/2;}
   }
   return nr;
}

void afisare(int i)
{
	if(p[i]>0)
		afisare(p[i]);
	g<<v[i]<<" ";
}
int main ()
{
	int i,poz,n,max;
	ifstream f("scmax.in");
	f>>n;
	for(i=1;i<=n;i++)
		f>>v[i];
	f.close();
	a[1]=1;
	l[1]=1;
	nr=1;
	for(i=2;i<=n;i++) {
		poz=cautarebinara(v[i]);
		p[i]=l[poz];
		a[i]=poz+1;
		l[poz+1]=i;
		if(nr<(poz+1))
			nr=poz+1;
	}
	max=0;
	for(i=1;i<=n;i++)
		if(a[i]>max) {
			max=a[i];
			poz=i;
		}
	g<<max<<'\n';
	afisare(poz);
	return 0;
}