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: ['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']

Answer: b, c, d, f, g, i, j, k, l, n, o, t, u, v, x


Question: ['g', '4165', 'n', 'w', 'n', 'e']

Answer: e, g, n, w


Question: ['s', 'g', '5039', '2373', '6853', 'a', 'v', '3027', '7213', 'f', 's', 'j', '3149', '2323', '5879', '4333', '3515', '287', 'c', '1929', '5363', '9135', '1013', '5485', '9983', '9263', 'j', '3011', '337', 'h', '4983', 'b', '7591', 'q', '2733', '3935', 'r']

Answer:
a, b, c, f, g, h, j, q, r, s, v