#include<fstream>
#include<iostream>
using namespace std;
#define MAX 100001
ifstream fin("scmax.in");
ofstream fout ("scmax.out");
int a[MAX],l[MAX],poz[MAX];
int n,m,prim;
void citire()
{
int i;
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i];
}
void subsir()
{
int i,j;
for(i=n;i>=1;i--)
{ l[i]=1;poz[i]=0;
for(j=i+1;j<=n;j++)
if(a[i]<a[j] && l[i]<1+l[j])
{l[i]=1+l[j];poz[i]=j;}
if(m<l[i]) {m=l[i];prim=i;}
}
}
void tipar()
{
int i;
for(i=prim;i>0;i=poz[i])
fout<<a[i]<<' ';
}
int main()
{
int i ;
citire();
subsir();
int cnt = 0;
for ( i = prim ; i > 0 ; i = poz[i] )
cnt ++;
fout << cnt << endl;
tipar();
fin.close();
return 0;
}