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.

[Q]: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']
[A]: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z


[Q]: ['2165', 'f', '5081', 's']
[A]: f, s


[Q]: ['v', '9413', '8085', '7935', '6547', 'w', '6513', '399', 'g', 'e', 't', '8661', 'r', 'e', '9185', '3799', '4061', '8295', '1043']
[A]:
e, g, r, t, v, w