#include <iostream>
#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
#define MAX 100002
int a[MAX],b[MAX],poz[MAX];
int n,m;
int caut(int p,int u,int x)
{int m;
 while(p<=u)
 {m=p+(u-p)/2;
  if(x<a[b[m]])
        p=m+1;
   else u=m-1;
 }
 return p;
}
void subsir()
{int i,k;
 a[0]=123456789;
 for(i=n;i>=1;i--)
 {poz[i]=0;
  k=caut(1,m,a[i]);
  if(k>m)
  {poz[i]=b[k-1];
  m=k;
  b[k]=i;
  }
  else
  {poz[i]=b[k-1];
   if(a[b[k]]<a[i])
    b[k]=i;

  }
 }
}
void tipar()
{int i;
 g<<m<<endl;
 for(i=b[m];i>0;i=poz[i])
    g<<a[i]<<' ';
}
int main()
{f>>n;
 for(int i=1;i<=n;i++)
    f>>a[i];
 subsir();
 tipar();
}