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: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']

A: c, h, l, u, x
****
Q: ['j', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']

A: c, h, j, k, m, p, r, t, w, x, y, z
****
Q: ['5555', 'd', '3551', 'u', 'h', 'o', 'd', 'a', 'z', 'm', '5419', '2781', 'x', 'i', '9451', 's', 'u']

A:
a, d, h, i, m, o, s, u, x, z
****