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:
['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']

Ex Output:
b, d, f, j, k, n, o, q, r, u, z


Ex Input:
['3627', '2051', '3203', 'c', 'r', 'a', '1453', 'e', 'z', 't', '1093', '4651', 'a', 'f', '8159', '9623', 'l', 't', 'r', '6963', '7071', '8103', '3493', 'y', '2369', '609', '2011', 'f', '187', 'f', 'c']

Ex Output:
a, c, e, f, l, r, t, y, z


Ex Input:
['b', 'w', '4313', 'i', '171', '7209', '4115', 'm', '7255', '931', '4371', 'l', 'x', 'o', 'r', 'p', '4415', '9643', 'e', '6359', '1375', '8283', '1655']

Ex Output:

b, e, i, l, m, o, p, r, w, x