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.

Example Input: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']
Example Output: l, o, q, w, x

Example Input: ['9947', '3353', '8643', '4621', '4857', 'y', '7075', 'c', '8911']
Example Output: c, y

Example Input: ['2231', '6017', '4215', 'y', '3947', '6945', '1185', '6431', 'd', 'x', '329', 'e', '1421', '4461', '1339', '3571', 's', '3365', '3665', 'j', '4803', '1379', 'k', 't', '8867', '59', '3053', '3233']
Example Output:
d, e, j, k, s, t, x, y