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]: ['3947', '4809', 'b', 'a', '4769', '4179', '535', '5965', 'f', 'j', '2265', 'w', '3103', 'u']
[A]: a, b, f, j, u, w


[Q]: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']
[A]: a, c, e, h, i, o, p, s, u, w, x, z


[Q]: ['6133', 's', '9337', 'j', '5111', 'v', '6411', '4369', 'q', '4991', '9475', '3563', '5681', 'c', '971', 't', '339']
[A]:
c, j, q, s, t, v