#include<fstream.h>
ifstream f ("subsir2.in");
ofstream g("subsir2.out");
long n,i,lm,p,l[50001],a[50001];
void dinamica()
{
  int i,j,max;
  l[n]=1;
  for(i=n-1;i>=1;i--)
  {
    max=0;
    for(j=i+1;j<=n;j++)
      if(l[j]>max&&a[i]<=a[j])
	max=l[j];
      l[i]=max+1;
      if(lm<l[i])
	 lm=l[i];
       }
   g<<lm;
   g<<"\n";
 }

void drum()
 {

   int t;
   t=0;
   p=1;
   do
   {
     while(l[p]!=lm||a[t]>a[p])
       p++;
     g<<a[p]<<" ";
     t=p;
     lm--;
   }while(lm);
}
int main()
{


  f>>n;
  for(i=1;i<=n;i++)
    f>>a[i];
 dinamica();
 drum();

	return 0;
}