#include<fstream>

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int n,a[100010],x[100010],i,t[100010],u,j,p,k,m,s;

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];
    x[1]=1; p=1; s=1;
    for(i=2;i<=n;i++)
    {
        p=1; u=s;
        while(p<=u)
        {
            m=(u+p)/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]);
    return 0;
}