#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,a[100010],x[100010],i,t[100010],u,j,p,k,m,s;

void afis(int k)
{
    if(k!=0)
    {
        afis(t[k]);
        g<<a[k]<<" ";
    }
}

int main ()
{
    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;
}