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]: ['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']
[A]: c, e, f, h, j, l, n, p, q, s, v, w, x


[Q]: ['1799', '6409', '9257', '5923', 'm', 'j', '2565', '715']
[A]: j, m


[Q]: ['6083', '4995', '6275', '4579', '7735', 'f', 'k', '3715', '3025', '2125', 'c', 'c', 'u', '969', '5763', 'e', '1487', 'v', 'p', '8949', '63', 'q']
[A]:
c, e, f, k, p, q, u, v