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]: ['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']
[EX A]: a, b, e, f, g, h, i, j, k, n, p, r, u, y

[EX Q]: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']
[EX A]: a, b, d, f, j, k, m, r, t, u, w, x, z

[EX Q]: ['7043', 'e', 'g', '1165', '6133', '3795', '8583', 'p', '4733', 'm', 'j', '8503', '5305', 'a', '7525', 'c', '3509', '1213', '7993', '3367', 'r', '6583', '5441']
[EX A]:
a, c, e, g, j, m, p, r