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]: ['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
[EX A]: e, f, i, j, r, s, u, v, w

[EX Q]: ['m', '6761']
[EX A]: m

[EX Q]: ['z', 'h', 'c', '4939', 'p', '6649', 'k', '3769', 'n', 'e', 'p', 'l', '6735', '5287', 'n', 'y', 'l', 'p', 'c', 's', '7485', 'c', '9063', 'q', 'g', 'c', 'k', 'd', '3461', 'r', '9323', 'l']
[EX A]:
c, d, e, g, h, k, l, n, p, q, r, s, y, z