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: ['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']

A: f, h, i, k, m, n, o, s, u
****
Q: ['t', 'a', '1895', '5351', '2393', 'i', 'e', 'l', '5693', 'd', 'p', 'm', '9325', '2575', 'd', '6109', 'f', '5111', '4931', 'x', '923', 'o', '4255', 'e', 'l', 'p', '2493', '2693', '6033', 'w', '701', '4343', '7723', 'n', '7131', 's', '5465', 'y', '633', '3353']

A:
a, d, e, f, i, l, m, n, o, p, s, t, w, x, y
****