#include<fstream.h>
#define N 100001
long a[N],b[N],p[N],i,j,k,c,m=0,n,u,v;
int main()
{ifstream f("scmax.in");
ofstream g("scmax.out");
f>>n;
for(i=1;i<=n;i++)
      f>>a[i];
a[0]=b[0]=0;
for(i=1;i<=n;i++)
      {if(a[b[m]]<a[i])
             p[i]=b[m],b[++m]=i;
      for(j=0,k=m;j<k;)
             {c=(j+k)/2;
             if(a[b[c]]<a[i])
                     j=c+1;
             else
                     k=c;}
      if(a[i]<a[b[j]])
             {if(j>0)
                     p[i]=b[j-1];
             b[j]=i;}}
for(u=m,v=b[m];u--;v=p[v])
      b[u]=v;
g<<m<<"\n";
for(i=0;i<m;i++)
      g<<a[b[i]]<<" ";
f.close();
g.close();
return 0;}