In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

[Q]: ['h', 'g', '4563', 'v', 'm', '107']
[A]: g, h, m, v


[Q]: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']
[A]: b, f, g, j, q, r


[Q]: ['9947', '3353', '8643', '4621', '4857', 'y', '7075', 'c', '8911']
[A]:
c, y