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.

['9113', '3625', 'u', '8189', '3649', '259', '5539', '1583', 'g', '4037', 'y', 'v', '8337', 'd', 'q', 'j', 'c', 'h', 'p', '1601', 'z', 'c', 'n', '1767', '1679', '1805', 'm', '4469', '2487', '6015', '973']
c, d, g, h, j, m, n, p, q, u, v, y, z

['k', 'v', 'e', '6377', 'y', '3585', '4535', 'f', 'g', 'm', 'f', '8369', 'v', '7445', '4527', '9383', 'n']
e, f, g, k, m, n, v, y

['e', '1159', 'c', 'p', 'c', '1713', '825', '6079', '8147', '25', 'l', 'x', '1281', 'p', '4145', '7275', 'u', '411', 'h', 'e', 'x', 'x', 'v', 'k', 's', '1785', '7021']

c, e, h, k, l, p, s, u, v, x

