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.

['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']
a, c, e, g, j, l, n, q, s, x

['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']
p, q, y

['c', '2227', '6011', '1249', '4175', 'f', 'l', 'o', '9557', 'u', '3949', 'q', 'i', 'a', '437', 'p', '3409', 'a', 'e', 'b', '5045', 'z', 'a', '3807', '8947', 'i', '153', '6843', '235', '3301']

a, b, c, e, f, i, l, o, p, q, u, z