#include <cstdio>
int n,v[100003],a[100003],b[100003],maxx,k,L[100003],nr,numar;

void afis(int i)
{
    if(b[i]>0)
        afis(b[i]);
    printf("%d ",v[i]);
}

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

int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    nr=1;
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",v[i]);
    }
    a[1]=L[1]=1;L[0]=0;
    for(int i=2;i<=n;i++)
    {
        numar=caut(v[i]);
        b[i]=L[numar];
        a[i]=numar+1;
        L[numar+1]=i;
        if (nr<numar+1)
        {
            nr=numar+1;
        }
    }
    maxx=0;numar=0;
    for(int i=1;i<=n;i++)
        if(maxx<a[i])
        {
            maxx=a[i];numar=i;
        }
    printf("%d\n",maxx);
    afis(numar);
    return 0;
}