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.

Input: Consider 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']

Output: a, d, e, h, i, k, m, o, q, r, v, z


Input: Consider Input: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']

Output: b, e, f, g, k, l, n, q, v, w, y


Input: Consider Input: ['u', 'p', 'b', 'q', 'd', '6691', '9289', 'i', '2899', '7713', '7961', 'n', '3279', '8469', '9737', 'o', 'r', '3811', '9513', 'o', 'z', 'c', '2149', 'a', '2857', '1835', '4161', 'n', 'b', '7007', 'a', 'a', 'e', 'h', '493', '4477', 'o', 'd', '251', '3703', 'r', '7663', '6533', '7769']


Output: a, b, c, d, e, h, i, n, o, p, q, r, u, z