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: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
Example Output: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y

Example Input: ['9113', '3625', 'u', '8189', '3649', '259', '5539', '1583', 'g', '4037', 'y', 'v', '8337', 'd', 'q', 'j', 'c', 'h', 'p', '1601', 'z', 'c', 'n', '1767', '1679', '1805', 'm', '4469', '2487', '6015', '973']
Example Output: c, d, g, h, j, m, n, p, q, u, v, y, z

Example Input: ['6785', 'g', '6697', '2301', 'k', '3681', '4811', '3005', 'u', 'u', '5315', '5343', '1223', '1775', 't', '1663', 'g', '93', '343', '7925', 'z', 'q']
Example Output:
g, k, q, t, u, z