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: ['9925', 'f', '6149', 's', 'd', 's', '75', '8577', '2319', 'b', '3769', '5211', 'q', 'm', '8127', 'f', '3801']
Example Output: b, d, f, m, q, s

Example Input: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
Example Output: c, g, j, m, q, r, s, w

Example Input: ['6715', 'i', 'b', '2825', 'm', 'w', '3887', 'x', '3141', '1599', 'z', 'c', '2605', 's', '2037', 'i', '2231', 'm', '9553', '1787', '7383', 'c', '6859', 'q', '7931', '6781', '1793', 'e', '1049', 'f', '5235', '8265', '9273']
Example Output:
b, c, e, f, i, m, q, s, w, x, z