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: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
Example Output: b, h, i, m, r, u, y, z

Example Input: ['6709', 't', 'n', 'k', '991', 'a', '8899', '3563', '527', 'm', '4599', '6679', 'm', 'x', 'f', 'o', '3275', 'x', '677', 'b', '3329', '3593', '5183', '5753', 'u', '6045', '2607', 'y', '9873']
Example Output: a, b, f, k, m, n, o, t, u, x, y

Example Input: ['h', 'c', 'p', '8795', '3675', '9265', '7227', 'k', 't', 'g', '2707', 'q', 'g', 'p', 'k', '9519', 'b', '911']
Example Output:
b, c, g, h, k, p, q, t