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: ['1801', 'q', '5101', '8863', '2309', 'p', '8789', '9529', '6135', '5523', 'f', '8889', '7639', 'k', '263', '5751', '5529', 'g', '1451', '4143', 'e', '6987']

A: e, f, g, k, p, q
****
Q: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

A: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z
****
Q: ['j', '8319', 'j', '8419', '947', '1861', '809', 'g', '9697', '8007', '8441', 'q', '9915', '2259', '8891', '4491', '1627', 'w', 'b', '6275', '939', '1911', '4893', 'f', 'w', 'i', '7043', '9707', '3195', 'l', '4687', 'd', 'n', '6607', 'h', 'j', '5097']

A:
b, d, f, g, h, i, j, l, n, q, w
****