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.

['v', '6635', '5395', '3263', '4391', 'h', '1521', 'f', '9861', '6125', '1673', '3679', '8681', '4967', 'f', 'a', 'c', 'k', 'n', '4155', 'e', 'm', 'i', '1699', 'r', 'f', 'u', 'r', '3451', 'v', '7239', 'o', '4359', 'l', 'a', '2925']
a, c, e, f, h, i, k, l, m, n, o, r, u, v

['2165', 'f', '5081', 's']
f, s

['q', 'm', '3593', '2929', 'l', '2503', 'f', 'p', 'h', '3407', '3645', 'x', '7197', 'm', 'm', 'm', '8637', '4629', '153', 'l', 'l', 'y', 'f', '6831', 'd', '9701']

d, f, h, l, m, p, q, x, y