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]: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
[A]: a, c, f, h, i, l, p, w


[Q]: ['v', '6635', '5395', '3263', '4391', 'h', '1521', 'f', '9861', '6125', '1673', '3679', '8681', '4967', 'f', 'a', 'c', 'k', 'n', '4155', 'e', 'm', 'i', '1699', 'r', 'f', 'u', 'r', '3451', 'v', '7239', 'o', '4359', 'l', 'a', '2925']
[A]: a, c, e, f, h, i, k, l, m, n, o, r, u, v


[Q]: ['d', 'p', '8613', '5689', '2687', 'z', 'r', '1559', '5723', 'y', 'x', '7985', 'e', '7631', 'j', 'k', '2095', '1659', '7633', '503', 'q', 'b', 'a', '6531', 'd', 'a', 'y', '3055', 'y', 'l', 'k', '5117', '6271', '753', '4199', '2239', '2561', 'o']
[A]:
a, b, d, e, j, k, l, o, p, q, r, x, y, z