#include<cstdio>
using namespace std;
int n,a[100003],sol[100003],L[100003];
int il,l,r,m,poz,k,j,i;
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]);
    k=0;sol[0]=0;
    for (i=1;i<=n;++i)
    {
        if (a[i]>sol[k])
            {
                sol[++k]=a[i];
                L[i]=k;
            }
        else
        {
            l=1,r=k,poz=k;
            while (l<=r)
            {
                m=(l+r)/2;
                if (sol[m]<a[i]) l=m+1;
                    else poz=m,r=m-1;
            }
            sol[poz]=a[i];
            L[i]=poz;
        }
    }
    printf("%d\n",k);
    for (i=n,j=0;i>0 && k;--i)
        if (L[i]==k) sol[++j]=a[i],--k;
    for (i=j;i>0;--i)
        printf("%d ",sol[i]);
    return 0;
}