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: ['4927', 'h', 'x', '4719', 'j', 'f', '7797', 'l', 'i', 'q', 'x', 'i', 'k', '3215', 'k', '1625', 'g', 't', 'i', 'w', 'n', '6659', '8355', '831', 'h', '9723']
Example Output: f, g, h, i, j, k, l, n, q, t, w, x

Example Input: ['699', 'd', '6027', 'j', 'e', 'c', 't', '9983', '5471', '2649', 't', '2631', 'r', 'h', '293', 'j', '8699', 'p', 'k', '5433']
Example Output: c, d, e, h, j, k, p, r, t

Example Input: ['w', '7951', 'b', 'u', '5441', '7805', '2033', 'p', 'r', 'l']
Example Output:
b, l, p, r, u, w