#include <iostream>
#include <fstream>
using namespace std;
int a[100002],n,b[100002];
int c[100002];
int lmax,p1,p2,mij;
int main()
{
    ifstream f("scmax.in");
    ofstream g("scmax.out");
    f>>n;
    for(int i=1;i<=n;++i)
    {
        f>>a[i];
    }
    lmax=0;
    for(int i=n;i>=1;--i)
    {
        p1=1;
        p2=lmax;
        while(p1<=p2)
        {
            mij=(p1+p2)/2;
            if(b[mij]>a[i])
            {
                p1=mij+1;
            }
            else
            {
                p2=mij-1;
            }
        }
        if(p1>lmax)
        {
            ++lmax;
            b[lmax]=a[i];
            c[i]=lmax;
        }
        else
        {
            c[i]=p1;
            if(b[p1]<a[i])
            {
                b[p1]=a[i];
            }
        }
    }
    g<<lmax<<"\n";
    int k=0;
    a[0]=0;
    for(int i=1;i<=n;++i)
    {
        if(c[i]==lmax && a[k]<a[i])
        {
            k=i;
            g<<a[i]<<' ';
            lmax--;
        }
    }
    return 0;
}