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.

Ex Input:
['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']

Ex Output:
b, d, f, j, k, n, o, q, r, u, z


Ex Input:
['4993', '6641', '3127', '9409', '8453', '5909', '6109', 'y', 'f', '6859', 'c', '3863', 't', '1221', '3689', 'w', 'h', '7947', 't', '5979', 'l', 'i', '1321', '3149', 'l', 'v', '3825', 'z', '9297', 'f', 'e', '7205', 'a', 'a', '2645', '391', '4965', 'w', 'h', '7715', '9409', '3603', '4147']

Ex Output:
a, c, e, f, h, i, l, t, v, w, y, z


Ex Input:
['b', 'a', 'h', 'i', 'r', 'r', 'm', '327', '1521', '1651', 't', '6671', '1553', 's', 'f', '3477', 'z', 'u', '8159', '6239', '9911', '1707', 'y', 'v', '3279', 'n', '1013', '4525', '6303', 'e', '4129', 'o', '7977', 'u', '6117', '2465', '4263', 't', 'v', '5653', '3699', '5607']

Ex Output:

a, b, e, f, h, i, m, n, o, r, s, t, u, v, y, z