#include<fstream>
using namespace std;
ofstream g("scmax.out");
int a[10000],x[10000],t[10000],n,i,j,s,p,u,m;
void afis(int m)
{    if(m){
        afis(t[m]);
        g<<a[m]<<" ";
    }
}
int main()
{
    ifstream f("scmax.in");
    f>>n;
    for(i=1;i<=n;i++)
      f>>a[i];
      x[1]=1;
      p=1;
      s=1;
      for(i=2;i<=n;i++)
      {   p=1;
          u=s;
          while(p<=u)
          {
              m=(u+p)/2;
              if(a[i]>a[x[m]])
                p=m+1;
                else
                u=m-1;
          }
          if(p>s)
          s++;
          x[p]=i;
          t[i]=x[p-1];
      }
      g<<s<<"\n";
    afis(x[s]);
      return 0;
}