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]: ['u', 'd', '4193', '5687', 'p', 'r', '7787', 't']
[A]: d, p, r, t, u


[Q]: ['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']
[A]: a, b, c, e, f, g, j, l, o, q, s, t, u, w, y


[Q]: ['5679', 'd', 'j', 'u', '135', '4887', '9325', '2807', '2867', '4657', '4371', 'w', '6053', '9465', '5715', '5773', 'k', '2247', 'h', 'x', 'n', 't', '117', '7027', '7793', '4031', '2937', '4851', 'l', 'z', 'r', 'y', 'b', '2831', '267', 'k', 'o', '3259', 'g', 'f', '5731', '2833', 'z', 'n']
[A]:
b, d, f, g, h, j, k, l, n, o, r, t, u, w, x, y, z