#include<fstream>
using namespace std;
FILE *g=fopen("scmax.out","w");
int i,j,n,m,b[100001],p[100001],l[1000001],x,nr=1,a[1000001];
int max1,poz;
int cauta(int x)
{
	int st,dr,mij;
	st=0,dr=nr,mij=(st+dr)/2;
	while(st<=dr)
	{
		if(a[l[mij]]<x&&a[l[mij+1]]>=x)
			return mij;
		else
			if(a[l[mij+1]]<x)
				st=mij+1,mij=(st+dr)/2;
			else
				dr=mij-1,mij=(st+dr)/2;
	}
	return nr;
}
void afis(int i)
{
	if(p[i]>0)
		afis(p[i]);
	fprintf(g,"%d ",a[i]);
}
int main()
{
	FILE*f=fopen("scmax.in","r");
	
	fscanf(f,"%d",&n);
	for(i=1;i<=n;i++)
		fscanf(f,"%d",&a[i]);
	b[1]=l[1]=1;
	l[0]=0;
	for(i=2;i<=n;i++)
	{
		x=cauta(a[i]);
		p[i]=l[x];
		b[i]=x+1;
		l[x+1]=i;
		if(nr<x+1)
			nr=x+1;
	}
	max1=poz=0;
	for(i=1;i<=n;i++)
		if(b[i]>max1)
		{
			max1=b[i];
			poz=i;
		}
		fprintf(g,"%d\n",max1);
		afis(poz);
	return 0;
}