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.

['7989', '6897', 'o', 'v', '5687', '2933', 'w', '8207', 'y', 's', 'w', '3013', 'h']
h, o, s, v, w, y

['d', '6003', 'k', '1987', '1877', 'a', '2615', 'n', 's', 'f', 'b', 'm', '1149', '8293', '5803', 'e', '2697', '5917', 'p', '6035', '2385', 'i', 'u', 'm', '9565', '4523', 'b', 'v', '2577', '9725', '6093', '6203', '4197', '8477', 'o', 'd', '3637', '9827', '5523', '7189', 'j', '8893', 'h', 'q']
a, b, d, e, f, h, i, j, k, m, n, o, p, q, s, u, v

['t', 'e', 'q', 'f', 'w', '7511', 'g', 'r', '4409', '2719', '2633', 'h', '7075', '6641', 'p', '4053', '7363', 'r', 'g', '2649', '5399', 'g', '9107', '7801', 'a', '3713', 'f', '3135', 'v', 'a', '1813', '6475', 'r', 'f', '8433', 'i', '99', '9303']

a, e, f, g, h, i, p, q, r, t, v, w