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: ['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: ['4041', 'l', 'g', '9571', '9295', '1395', 'l', 'p', 'f', 'w', 'g', '1721', '2421', 'w', 'z', '2235', 'p', '7851']
Example Output: f, g, l, p, w, z

Example Input: ['4185', '3163', 'm', 'x', 'v', '7581', 'a', '2631', 'e', '243', 'l', '4669', '5485', '6435', 'h', 't', '4869', '425', 't', '9463', 'l', '5863', 'n', 'i', '1533', '423', 'h', 'f', '4105', '9809', 'z', '6379', 'a', '5253', 's', 'e', 'b', 'h', '1933', 'e', 'a', '859', '4501', 'j', '8045']
Example Output:
a, b, e, f, h, i, j, l, m, n, s, t, v, x, z