Given a range of cells, each holding a single uppercase letter or its lowercase version, can I find out how many lowercase vs. uppercase characters there are, without using named ranges?

Like, A1 = "S", A2 = "s".

This CountIf both of them, so that doesn't work?

=COUNTIF(A1:A2,"S")

While mixing SumProduct with Exact, seems to require Named Ranges, (calling A1:A2, "Letters".) which I don't want, since I want be able to know what I'm doing just by looking at my formulas.

I tried replacing Letters with {A1,A2}, but that doesn't seem to work?

=SUMPRODUCT(--EXACT("D",Letters))