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]: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
[EX A]: b, h, i, m, r, u, y, z

[EX Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[EX A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

[EX Q]: ['n', 'd', 'l', 'l', 'h', 'y', 's', 'p', 'z', 'd', 'b', 'a', 'v', 'b', 's', 'p', 'k', 'o', '6939', '2951']
[EX A]:
a, b, d, h, k, l, n, o, p, s, v, y, z