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: ['w', '491', 'x', 'u', 'z', 'q', '5411', '7629', '8261', '8629', '1441', '5139', 's', 'm', '6463', 'u', 'z']
Example Output: m, q, s, u, w, x, z

Example Input: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']
Example Output: d, e, g, h, i, m, t, u, v, x, y

Example Input: ['55', 'n', 's', 'a', '4041', 's', '5727', '3169', '1453', '9207', '1273', 'z', '6731', '165', '7405', '7143', '6619', '2023', '9207', 'f', '1109', 'o', '35', 's', 'o', '7083', '4073', 'b', 'i', '3911', '4973', 'c', '1457', '523']
Example Output:
a, b, c, f, i, n, o, s, z