Selecting selectors

I've been thinking in this simple document structure:
<a>
    <c>
    </c>
</a>
<c>
</c>
<c>
</c>
....
<a>
    <c>
    </c>
</a>
<c>
</c>
<c>
</c>
....

For selecting the first C after A what might I do?

A > C + C ????

Is the interpretation of this last selector left to right or right to
left? I mean, is this (pseudonotation)

(A>C)+C

or

A>(C+C)