#include<cstdio>
using namespace std;
int n,m,x,p,a[100010],st[100010],poz[100010],v[100010],i;
int cautbinar(int l,int r,int x)
{
    int p;
    while (l<r)
    {
        p=(l+r)/2;
        if (st[p]>x) l=p+1;
            else r=p;
    }
    p=(l+r)/2;
    if (st[p]<=x) p++;
    return p;
}
int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);
    scanf("%d",&n);
    for (i=1;i<=n;i++)
        scanf("%d",&a[i]);
    st[1]=a[1];
    m=1;
    poz[1]=1;
    for (i=2;i<=n;i++)
    {
        x=a[i];
        if (a[i]>st[m]){ m++;
                         st[m]=a[i];
                         poz[i]=m;
                        }
                else { if (a[i]==st[m]) poz[i]=m;
                            else { p=cautbinar(1,m,a[i]);
                                   st[p]=a[i];
                                   poz[i]=p;
                                        }
                        }

    }
    printf("%d\n",m);
    p=m;
    for (i=n;i>=1 && p>0;i--)
    {
        if (poz[i]==p) { v[p]=a[i];
                         p--;
                            }
    }
    for (i=1;i<=m;i++)
        printf("%d ",v[i]);
    return 0;
}