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: ['8887', '1199', 'r', '7209', 'k', '7567', '7239', 'k', '5123', 'w', '4523', 't', 'd', '5289', '5737', '485', 'w', 't', '7651', 'v', '7213', '7687', 'y', 'w', '7265', 'b', 'b', '3667', 'z', '9935', 'i', 'l', 'u', '6715', 'j', '9815', '8925', '7941', 'w', 'm', '3907', '621', '5523', '5849']
Example Output: b, d, i, j, k, l, m, r, t, u, v, w, y, z

Example Input: ['5971', 'x', 'c']
Example Output: c, x

Example Input: ['8985', '6857', 'w', 'w', 'm', '2525', 'i', '1723', '451', '9379', '1899', '6053', '8195', 'x', 'g', 'o', 'h']
Example Output:
g, h, i, m, o, w, x