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.
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Question: ['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']

Answer: c, e, h, k, p, q, u, v, y


Question: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']

Answer: a, c, e, o, r, s, z


Question: ['j', 'o', '3135', 'q', '5147', 'd', 'x', 'h', '2617', '9761', '6007', 'o', '3509', 'h', '4239', 'n', 'a', '2885', 'm']

Answer:
a, d, h, j, m, n, o, q, x