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: ['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']
Example Output: b, f, h, i, o, p, q, s, u, w

Example Input: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']
Example Output: b, q, t, u, x, y

Example Input: ['181', '1195', '9661', '3997', '6027', 'e', 'n', 's', '9739', '6725', '5605', 'e', '5793', 'l', 'i', 'h', 'm', 't', 'x', '2129', 'w']
Example Output:
e, h, i, l, m, n, s, t, w, x