#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,v[100003],i,mj,k,st,dr,d[100003],t[100003],sol[100003],j;
int main()
{ f>>n;
for(i=1;i<=n;i++)
f>>v[i];
d[1]=1;
k=1;
  for(i=2;i<=n;i++)
  { st=1;
    dr=k;
    while(st<=dr)
    {mj=(st+dr)/2;
    if(v[d[mj]]<v[i])
      st=mj+1;
    else
      dr=mj-1;
    }
     if(st>k)
     k++;
     d[st]=i;
     t[i]=d[st-1];
  }
  g<<k<<'\n';
  i=d[k];
  while(i!=0)
  {
      sol[++j]=i;
      i=t[i];
  }
  for(i=k;i>=1;i--)
    g<<v[sol[i]]<<" ";
return 0;
}