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: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']
Example Output: e, l

Example Input: ['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']
Example Output: c, d, e, f, h, j, l, m, o, q, u, x, z

Example Input: ['3181', 'c', '75', 'm', 'b', '3679', '1901', 'z', 'y', '3817', '7493', '5727', '3049', '7135', 'm', '3765', 'm', '5491', '4923', 'd', 'c', 'r', 'k', '5903', '129']
Example Output:
b, c, d, k, m, r, y, z