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: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']

A: b, d, f, i, k, q, s, v, w
****
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: ['8025', 'l', 'k', '8871', '3169', 'n', 'a', 'q', 'n', '849', '8847', 's', 'z', '9687', 'a', 'e', '4681', '267', 'h', '2323', '1423', 'j', 'v', 'g']

A:
a, e, g, h, j, k, l, n, q, s, v, z
****