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.

[EX Q]: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
[EX A]: g, h, k, l, o, t, y, z

[EX Q]: ['n', 't', '2901', '9697', 'a', 'j', 'x', 'a', '4437', '2255', '2177', 's', '3173', 'j', 't', '5713', '4091', '4253', '5553', 'i', '4533', 'i', 'e', '6899', 's', '3541', '2139', '2705', 'm', 'u']
[EX A]: a, e, i, j, m, n, s, t, u, x

[EX Q]: ['w', '2985', 'i', '7933', '2257', '6525', '7831', '3735', 'l', 'y', 'r', '3555', 'x', 'd', 'q']
[EX A]:
d, i, l, q, r, w, x, y