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: ['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']
Example Output: a, b, d, e, f, h, i, j, k, m, n, o, p, q, s, u, v

Example Input: ['l', 'u', '3901', '341', '5801']
Example Output: l, u

Example Input: ['m', '5115', '6767', 'r', 'v', '1071', '7433', 'n', 'n', 'e', '3281', 'q', '2899', '3493', 'w', 'c', 'u', 'j', 'o', 'b', 'l', 'w', 'p', 's', 'r', 'w', '8631', 'u', '2443', '837', 'e', '9247', 'o', '3587', '4557', 'v', '9675', '2759', '6257']
Example Output:
b, c, e, j, l, m, n, o, p, q, r, s, u, v, w