#include<fstream>
#define dim 100002
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int a[dim],x[dim],t[dim];
int n,i,st,dr,s,mij;
int afis(int m)
{
    if(m)
    {
        afis(t[m]);
        g<<a[m]<<" ";
    }
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
     f>>a[i];
    x[1]=1;
    s=1;
    for(i=2;i<=n;i++)
    {
        st=1;
        dr=s;
        while(st<=dr)
        {
            mij=(st+dr)/2;
            if(a[i]>a[x[mij]])
              st=mij+1;
            else
              dr=mij-1;
        }
        if(st>s)
         s++;
        x[st]=i;
        t[i]=x[st-1];
    }
    g<<s<<"\n";
    afis(x[s]);
}