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: ['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: ['e', '1251', 'y', '6689', '6389', 'h', 't', '503', '5093', 'e', '923', '7051', 'm', 'u', '4501', '3289', '6887', '8341', 'o', '3671', 'n', 'w', '7749', 's', 'j', 'o', '8429', 'q', 'v', 'p', 'd', 'g', 'i', 'f']
Example Output: d, e, f, g, h, i, j, m, n, o, p, q, s, t, u, v, w, y

Example Input: ['6943', '2465', '7525', '3471', '7161', '8733', '723', 'h', '9469', '9877', '189', 'z', '6079', 'm', '9359', 'i', '2173', 'd', '6673', 'p', 's', '6587', '3545', '473', '3387', '5031', 'g', '8825', '2725', 'r', 'q', '461', '8139', '8895', '25']
Example Output:
d, g, h, i, m, p, q, r, s, z