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: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']

A: d, e, k, l, o, s, t, u, w, y
****
Q: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']

A: d, e, h, k, l, n, o, q, r, u, z
****
Q: ['v', 'd', 'x', '8427', '8509', '4411', 'c', '3915', '8311', 'h', '3277', '7451', '1033', '4697', '4153', '7805', 'c', '7197', '215', '8561', 'o', '3503', 'n', '455', 'w', '8945', 'v', '9623', '3961', 'r', 'a', 'o', 'n', 'z', '5553', '2311', '2057', '3109', 'y', '3413', 's']

A:
a, c, d, h, n, o, r, s, v, w, x, y, z
****