#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
long long a[100005],n,i,j,x[10005],s,p,t[10005],u,m;

void afis(int k)
{
    if(k!=0)
        {afis(t[k]);
        g<<a[k]<<" ";}
}

int main ()
{
    f>>n;
    for(i=1;i<=n;i++)
    f>>a[i];
    s=1; x[1]=1;
    for(i=2;i<=n;i++)
    {
        p=1;
        u=s;
        while(p<=u)
        {
            m=(p+u)/2;
            if(a[i]>a[x[m]]) p=m+1;
            else u=m-1;
        }
        if(p>s) s++;
        x[p]=i;
        t[i]=x[p-1];
    }
    g<<s<<"\n";
    afis(x[s]);
}