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: ['t', 'm', '7071', 'j', '353', 'n', 'a', 'm', '9211', 'i', '9537', 'q', '7669', '869', '8753', '8071', '375', '9971', 'c', 'n', '5851', 'u', '2491', '2697', '2789', '4683', '879', 'q', 'g', 'p', 'd', 'x', 'r', 'i', '8171', '5449', '2477', '1151', 'z', '3845', '1079', 'j', 'n', 'p', '8199']
Example Output: a, c, d, g, i, j, m, n, p, q, r, t, u, x, z

Example Input: ['p', 'v', '1099', 'y', '1313', 's', '181', 'u', 'e', 'u', '8435', '4125', '8661', 'c', '4605', 'f', 'x']
Example Output: c, e, f, p, s, u, v, x, y

Example Input: ['u', 'r', 'i', 'y', 'u', '8607', '8379', 'y', 'f', '4965', '5963', 'q', 'n', '9969', '6309', '6107', 'l', '3131', 'h', '6591', '1797', '5383', 'w', '7443', 'j', 'l', '2119', '1523', '9051', '4113', 'y', '825', '283', '8017', 'i', 'p', 'm', 'b', 'q', '7279', 'm', '2167', 'y', 'm']
Example Output:
b, f, h, i, j, l, m, n, p, q, r, u, w, y