#include <fstream>
using namespace std;
ifstream fin ("scmax.in");
ofstream fout("scmax.out");
int v[100001],s[100001],l[100001],last,j,lo,hi,n,m;

int main ()
{
    fin>>n;
    for (int i=1;i<=n;i++)
    {
        fin>>v[i];
        if (v[i]>s[last]) s[++last]=v[i],l[i]=last;
        else
        {
            lo=0;
            hi=last+1;
            while (hi-lo>1)
            {
                m=(lo+hi)/2;
                if (v[i] <= s[m]) hi=m;
                else lo=m;
            }
            s[hi] = v[i];
            l[i] = hi;
        }
    }
    fout<<last<<"\n";
    j=last;
    for (int i=n;i>0;i--)
    {
        if (j!=l[i]) continue;
        s[j]=v[i];
        j--;
    }
    for (j=1;j<=last;j++) fout<<s[j]<<" ";
}