How to do collation sorting with lowercase first?

Input

For the given list of below strings,

Senthil
Anbu
arthi
Sugumar
suresh
venila

Expected

I want the sorting order to be

arthi
Anbu
suresh
Senthil
Sugumar
venila

Actual

But getting the follow order

Anbu
arthi
Senthil
Sugumar
suresh
venila

I tried the following option

strength primary
caseLevel off
caseFirst lower

How to tailor the rules, so that i can get the desired sort order?

Thanks in advance. Any help is much appreciated.

Append rules:
> &a<A<b<B<c<C<d<D<e<E<f<F<g<G<h<H<i<I<j<J<k<K<l<L<m<M<n<N<o<O<p<P<q<Q<r<R<s<S<t<T<u<U<v<V<w<W<x<X<y<Y<z<Z

It works. But there is probably a more elegant solution.