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: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']

A: e, g, h, k, l, m, r, s, y, z
****
Q: ['9579', 'm', 'v', 'r']

A: m, r, v
****
Q: ['n', 'h', 'o', 'i', '2173', '7941', 'n', 'i', 'm', 'r', '7565', 'l', 'l', '923', '751', '4163', '443', 'b', '3707', '2515', '7309', 'g', 'z', '3663', 'i', '6309', 'i', '1159', '2683', 'h', '2097', 'y', '6521', '5381', '183', '8875', 't', 's', '1893', '3585', 'y']

A:
b, g, h, i, l, m, n, o, r, s, t, y, z
****