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]: ['2943', 'k', '8519', '9103', 'j', '2461', '1049', '2211', '8761', 'l', 'e', '8939', '6013', 'r', '9089', '5781', '5383', '5495', '6699', '7307', '2733', '933', '9865', 'g', '6471', '3179', 'm', '8231', 't', 'e', 'u', '9909', 'g', 'g', '9431', '6521', 'y', 'g', '1415', 'e']
[EX A]: e, g, j, k, l, m, r, t, u, y

[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]: ['8707', 'e', 'y', '4427', 'r', 't', '4833', 'v', 'f', '8283', 'p', 'l', 'b', 'n', 'q', 'k', 'm', 'f', '9809', '4867', '9995', '6719', '5915', '1857', '8923', 'j', 'e', '1621', 'g', 'e', 'u']
[EX A]:
b, e, f, g, j, k, l, m, n, p, q, r, t, u, v, y