What is the language with least letters in alphabet?

The language with the fewest letters in its alphabet is Rotokas, a language spoken in Papua New Guinea. It has only 12 letters:

* a, e, i, o, u

* k, p, t, s, w

* g, b

It's important to note that the number of letters in an alphabet doesn't necessarily reflect the complexity of the language. Rotokas, despite its small alphabet, has a complex system of tones and sounds, making it quite challenging to learn.