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]: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']
[EX A]: a, b, c, f, g, h, l, o, r, t, v, x, z

[EX Q]: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']
[EX A]: d, e, g, l, n, p, s, t, x

[EX Q]: ['u', 'e', 'm', 'x', '5959', '4795', '3363', '7429', 'o', 'u', '7573', 'd', '9583', '2239', '8903', '5597', '9357', '6217', '1633', '7985', 'k', '9161', '4405', '9529', 'f', '895', 'g', '3355', 'y', '4053', '7353', '6273', '6383', '7497']
[EX A]:
d, e, f, g, k, m, o, u, x, y