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: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
Example Output: d, e, k, q, s, u, w

Example Input: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
Example Output: c, d, k

Example Input: ['667', '419', 'w', '8461', '1887', '9657', 'n', '5625', '9547', '3925', '5521', '2481', 'r', 'n', '7697', '2657', 'i', 'q', 't', '1479', '4743', 'o', '6225', '4329', 'n', 'y', '7357', '8109', 'n', 'u', 'd', 'b', '6239', '9623', 'o']
Example Output:
b, d, i, n, o, q, r, t, u, w, y