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: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']
Example Output: b, c, e, g, h, o, p, q, v, x, y, z

Example Input: ['8821', '9833', 'l']
Example Output: l

Example Input: ['6071', '3717', 's', '9377', 'o', '9527', '5519', 't', '6655', 'c', '1583', '7067', 'd', 't', '6781', 'z', 'e', '5687', 'e', '6771', 'u', 'h', '1167', '1951']
Example Output:
c, d, e, h, o, s, t, u, z