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', 'i']
Example Output: i, l

Example Input: ['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']
Example Output: l, y, z

Example Input: ['8311', '6059', '9361', 'q', '1163', '3879', '233', '7767', '6429', '99', 'x', '7073', '3857', '6647', '3615', 'k', '5999', 'o', '1623', 'i', 'a', '9643', 'l', 's', '8295', '5021', '1031', '975', '9993', '4545', '6977', '3683', '4661']
Example Output:
a, i, k, l, o, q, s, x