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: ['q', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']
Example Output: b, c, d, e, l, n, o, q, r, w

Example Input: ['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']
Example Output: a, d, e, h, i, k, m, o, q, r, v, z

Example Input: ['7431', 'e', '411', '2011', 'q', 'j', 'g', '5823', '1971', 'l', 'i', 'a', '5971', 'n', 'k', '3047', 'z', 'w', '2287', 'j', 'r', 'x', '7057', '3475', '5367', 'f', 'g', '1089', 'w', 'e', '1761', '5849', 'n', 'w', 'b', '4387', '2283', '6379']
Example Output:
a, b, e, f, g, i, j, k, l, n, q, r, w, x, z