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:
['6181', 'w', '4663', '5507', 'a', '6607', '869', '2669', 'r', '3629', 'r', 'l', '6599', '8885', 's', '4315', 'z', 'l', 'r', '1225', '8371', '1545', '7169', '1175', 'k', 'p', 'y', '7263', '5537', '8649', '3317', 'q', 'r', 'u', 'd', '4647', 'u', 'y', 'h', '9753', 'q', '725']

Ex Output:
a, d, h, k, l, p, q, r, s, u, w, y, z


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

Ex Output:
b, d, f, m, q, s


Ex Input:
['o', 'h', '7535', 'f', '8721', '2823', 'r', 'b', 'n', 'a', 'j', 'n', 'x', '6489', '7331', 'a', '4821', 'y']

Ex Output:

a, b, f, h, j, n, o, r, x, y