#include<stdio.h>
using namespace std;
#define dim 100005

int a[dim],b[dim],v[dim],i,j,n,x,max,ii,s[dim],s1;

int main()
{
FILE *f=fopen("scmax.in","r"), *g=fopen("scmax.out","w");

fscanf(f,"%d",&n);

for(i=1;i<=n;i++)
	fscanf(f,"%d",&a[i]);

for(i=1;i<=n;i++)
{
	x=a[i];
	for(j=i-1;j>=1;j--)
	{
	if(a[j]<x)
		if(b[j]>b[i])
		{
		b[i]=b[j];
		v[i]=j;
		}
	}
	b[i]++;
	
	if(b[i]>max)
	{
	max=b[i];
	ii=i;
	}
}
	
fprintf(g,"%d\n",max);
s1=1;
while(ii>0)
{
s[s1++]=a[ii];
ii=v[ii];
}
for(i=s1-1;i>=1;i--)
	fprintf(g,"%d ",s[i]);
fprintf(g,"\n");

fclose(f);
fclose(g);


return 0;
}