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: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']
Example Output: c, f, i, k, n, o, p, s, u, w, y, z

Example Input: ['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']
Example Output: a, b, f, g, i, l, p, z

Example Input: ['5021', '7901', '9251', '1169', 'a', '9859', 'g', '8461', '4669', 'n', '2721', '9591', 'y', 'r', 'u', '3265', 'x', 'x', '6565', 'z', '6983', 'b', '9305', '9597', 'z', '463', '9361', 'q', '9275', 'w', '4991', 'o', 'e', '905', '5079', '6403', '229', '7671', 'a']
Example Output:
a, b, e, g, n, o, q, r, u, w, x, y, z