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: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
Example Output: e, k, m, p

Example Input: ['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']
Example Output: b, l, o, q, u, v, w

Example Input: ['r', 't', 'u', 'f', 'q', '1733', 'y', 'q', '4987', '9365', '1333', 'r', 'q', 'z', '8245', '7857', '5395', '2915', 'z', '9665', '5097', '8679', '37', '2321']
Example Output:
f, q, r, t, u, y, z