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: ['2799', '7519', '345', 'e', 'l', '9369', '4703', '4111']
Example Output: e, l

Example Input: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']
Example Output: b, v, y

Example Input: ['j', '273', 'c', 'z', '6035', '3189', 'h', 'j', '2977', 'p', 't', '8821', 't']
Example Output:
c, h, j, p, t, z