#include<fstream>
using namespace std;
ifstream f ("scmax.in");
ofstream g ("scmax.out");

void DP(long v[], long n)
{
  long lungime,inceput,i,j;
  long *maxime=new long[n];
  long *urmatorul=new long[n];
  long *subsir=new long[n];
  maxime[n-1]    = 1;
  urmatorul[n-1] =-1;
  for(i=n-2;i>=0;i--)
  {
      maxime[i]    = 1;
      urmatorul[i] =-1;
      for(j=n-1;j>i;j--)
         if((v[i]<v[j])&&(maxime[i]<=maxime[j])) maxime[i]=maxime[j]+1,urmatorul[i]=j;
  }
  lungime = maxime[0];
  inceput = 0;
  for(i=1;i<n;i++)
      if(lungime<maxime[i]){ lungime=maxime[i];inceput=i;}
  //subsir[0] = v[inceput];
  g<<lungime<<"\n";
  g<<v[inceput]<<" ";
  for(i=1;i<lungime;i++) {inceput=urmatorul[inceput];subsir[i]=v[inceput];g<<subsir[i]<<" ";}
}

int main()
{
    long n,x,i;
    f>>n;
    long *v=new long[n];
    for(i=0;i<n;i++) f>>v[i];
    DP(v,n);
    f.close();
    g.close();
    return 0;
}