#include <fstream>

using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

int main()
{ int k,MAX=0,imax;
  fin>>k;
  int v[k],lmax[k],succ[k];
  lmax[k-1]=1;
  succ[k-1]=-1;

  for(int i=0;i<k;i++) fin>>v[i];

  for(int i=k-2;i>=0;i--)
  {
     int ll=0,jj=0;
     for(int j=i+1;j<k;j++)
       if(v[j]>v[i])
        if(ll<lmax[j]){ll=lmax[j];jj=j;}
     succ[i]=jj;
     lmax[i]=ll+1;
     if(MAX<lmax[i]) MAX=lmax[i],imax=i;
   }
   fout<<MAX<<'\n';
   int p=imax;
   while(p!=-1)
   { fout<<v[p]<<" ";
     p=succ[p];
   }

    return 0;
}