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: ['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']

A: a, b, e, f, g, h, i, j, k, n, p, r, u, y
****
Q: ['m', '6761']

A: m
****
Q: ['a', '4379', '3901', 'x', 't', 'x', 'l', '4591', 'g', 'm', '5169', '4379', '6775', '7435', 'o', '8645', 's', 't', '6049', '1229', 'x', 'k', 'p', '7371', '5305']

A:
a, g, k, l, m, o, p, s, t, x
****