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: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']
Example Output: d, e, g, h, i, m, t, u, v, x, y

Example Input: ['a', 'a', 'b']
Example Output: a, b

Example Input: ['4593', '1589', '8023', 'o', 'r', '3063', 'j', '2241', 's']
Example Output:
j, o, r, s