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: ['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']
Example Output: e, f, g, i, t, x, z

Example Input: ['6769', '1057', '1021', 'n', '8231', '9173', '8123', 'a', '6053', 'q', 'y', '883', 'r', '1215', 'x', 'o', '9531']
Example Output: a, n, o, q, r, x, y

Example Input: ['m', 'n', '3979', '6387', '123', 'l', '8705', 'v', '765', 'u', 's', '5875', '313', 'k', '2623', 'a', 'w']
Example Output:
a, k, l, m, n, s, u, v, w