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: ['9483', '501', 'j', 'k', '3103']
Example Output: j, k

Example Input: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']
Example Output: a, b, c, d, f, h, i, m, o, s, u, x

Example Input: ['5539', 'c', '8343', '8777', '4977', '3595', '8677', '7697', 'd', 'k', '8917', '4565', 'y', '8537', '8547', 's', 'i', 'y', 'p', '1827', 'c', 'l', 'z', '6159', '7379', 'r', '9653', '3965', 'i', 'h', '7695', 'i', '5035', 'm', '1315', '4191', 'e']
Example Output:
c, d, e, h, i, k, l, m, p, r, s, y, z