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.

['d', 'o', '7643', '9065']
d, o

['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
d, e, k, q, s, u, w

['i', 's', '4113', '1819', 'w', 'a', 'i', 'y', 'y', 't', 'b', '8433', 'c', '8893', 'v', 'f', 'r', 'e']

a, b, c, e, f, i, r, s, t, v, w, y