#include <iostream>
#include <fstream>
using namespace std;

int n,a[100005],iant[100005],ithis[100005],v[100005],vsz,i,iv;

void citire()
{
    FILE * f;
    f=fopen("scmax.in","r");
    fscanf(f,"%d",&n);
    int i;
    for (i=1;i<=n;i++)
        fscanf(f,"%d",&a[i]);
    a[0]=-2000000000;
    iant[0]=ithis[0]=0;
}

int bsearch(int val)
{
    int st=0;
    int dr=vsz;
    int ans=vsz+1;
    int mij=0;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        if (v[mij]<val)
            st=mij+1;
        else
        {
            ans=mij;
            dr=mij-1;
        }
    }
    return ans;
}

void afisare()
{
    ofstream g("scmax.out");
    int now=ithis[vsz];
    int r[100005];
    int rsz=0;
    while (now!=0)
    {
        rsz++;
        r[rsz]=a[now];
        now=iant[now];
    }
    g<<rsz<<'\n';
    int i;
    for (i=rsz;i>=1;i--)
        g<<r[i]<<' ';
    g<<'\n';
    g.close();
}

int main(void)
{
    citire();
    for (i=1;i<=n;i++)
    {
        iv=bsearch(a[i]);

        if (iv>vsz)
            vsz=iv;
        v[iv]=a[i];
        iant[i]=ithis[iv-1];
        ithis[iv]=i;
    }

    afisare();
    return 0;
}