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.

[EX Q]: ['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
[EX A]: e, f, i, j, r, s, u, v, w

[EX Q]: ['j', '8797', 'i', '5443', 'i', 'f', '7593', 'u', 'h', '3251', 'l', '681', 'y', 'n', 'r', '1699', '1379', '8987', '6955', 'x', 'p', 'x', '553', 'q', '5679', 'q', 'w', '9007', 'r', '8945', '7351', 'a', 'v', 'k', '1309', 'v', 'i', '4161', 'a', 'q', '2919', '6917', '6845']
[EX A]: a, f, h, i, j, k, l, n, p, q, r, u, v, w, x, y

[EX Q]: ['b', 'i', 't', '6939', 'r', '8893', '1957', 'u', '9143', '5497', 'o', '2805', 'g', 'j', '1725', 'j', 'm', 'p', 'a', '339', '7527', '4361', 'y', '971', 'w', '9153', '6847', 't', 'y']
[EX A]:
a, b, g, i, j, m, o, p, r, t, u, w, y