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: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']
Example Output: h, m, p, q, u, w, y

Example Input: ['2165', 'f', '5081', 's']
Example Output: f, s

Example Input: ['d', '109', 'e', 'f', '7357', '9237', '2365', 'q', '2381', 'e', '1925', '6751', '8105', 'a', '7225', '3665', 'f', 'i', 'j', 'a', 'k', '7075', '9553', 'q', 'g', '4931', 'k', '1553', 'p', 'j', '3265', 'w', '1787', 't', '565']
Example Output:
a, d, e, f, g, i, j, k, p, q, t, w