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: ['6575', '2057', '2135', '6259', '7741', '4919', '7461', 'v', '401', 'h', 'u', '2391', '2181', 'y', '9273', 'd', 'b', 's', '7993', '9323', 'b', '7015']
Example Output: b, d, h, s, u, v, y

Example Input: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
Example Output: a, h, o, p, y

Example Input: ['2435', '4021', 'l', '461', '1243', 'c', 's', 'i', 'l', '959', 'e', 'a', '9331', '1921', 'g', '1643', 'h', 'f', '2673', '3055', '7531', 'i', 'i', 'f', '3857', '9899', '9857', '9231']
Example Output:
a, c, e, f, g, h, i, l, s