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.

['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']
b, c, d, f, g, i, j, k, l, n, o, t, u, v, x

['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']
c, e, h, k, p, q, u, v, y

['7297', '7143', '1303', '9287', '5391', 'v', 'i', '6475', '3113', '8457', '4981', '5487', '325', 'n', 'j', 'l', 'u', '9629', 'y', '4721', '5637', '2289', '9573', 'z', '7381', 'r', '9865', 'n', '8469', 'j', '5919', '7029', 'd', '9297', 'n', 'y']

d, i, j, l, n, r, u, v, y, z