#include <iostream>
#include <cstdio>
#define NMAX 100001

using namespace std;

int a[NMAX],p[NMAX],b[NMAX],l[NMAX],n,nr;

int caut(int k)
{
    int p,u,m;
    p=0;
    u=nr;
    m=(u+p)/2;
    while(p<=u)
        if(a[l[m]]<k && a[l[m+1]]>=k)
            return m;
        else if(a[l[m+1]]<k)
        {
            p=m+1;
            m=(p+u)/2;
        }
        else
        {
            u=m-1;
            m=(p+u)/2;
        }
    return nr;
}

void afisre(int k)
{
    if(p[k]!=0)
        afisre(p[k]);
    printf("%d ",a[k]);
}

int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);

    scanf("%d",&n);
    nr=1;
    for(int i=1; i<=n; i++)
        scanf("%d",&a[i]);
    b[1]=l[1]=1;
    l[0]=0;
    int maxi=1;
    for(int i=2; i<=n; i++)
    {
        int poz = caut(a[i]);
        //cout<<poz<<" "<<nr<<endl;
        p[i]=l[poz];
        b[i]=poz+1;
        l[poz+1]=i;
        if(nr<poz+1)
            nr=poz+1;
        if(b[i]>b[maxi])
            maxi=i;
    }

    printf("%d\n",b[maxi]);
    afisre(maxi);
    return 0;
}