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.

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

Ex Output:
d, e, k, q, s, u, w


Ex Input:
['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']

Ex Output:
a, b, c, d, e, j, k, l, n, o, p, r, y, z


Ex Input:
['8949', 'm', 'g', '7283', '2689', '4243', 'm', '9391', '8365', '871', '9307', 'v', '6103', '1449', '5779', 't']

Ex Output:

g, m, t, v