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]: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']
[EX A]: c, e, f, h, j, l, n, p, q, s, v, w, x

[EX Q]: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']
[EX A]: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z

[EX Q]: ['a', 't', 'r', '7799', 'r', 'f', '5317', 'd', '9171', 'o', '5677', 'x', '1649', 'x', 'x', 'p', '5353', 'i', '3317', '5551', 'q', '583', '7893', 'a', 'u', '6133', 'h', 'z', 'c', 'z', 'h', '8091', 'd', 'j', 'z', '3837', 'x', 'j', 'v', 'q', '5783', '3027', 'h', '2185', 'e']
[EX A]:
a, c, d, e, f, h, i, j, o, p, q, r, t, u, v, x, z