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]: ['s', 's', '3619', '6051', 'h', '213', '3937', 'v', 'p', 'y', '8449', '9337', '5327', 'a', 'a', 'w', '3985', 'n', 'm']
[EX A]: a, h, m, n, p, s, v, w, y

[EX Q]: ['z', 'h', '2065', '6773', 'v', '151', '8957', 't', 'l', 'j', '7867', 'v', '799', '9009', '4317', 'm', '6921', 'r', '1245', '5637', 'x', '4465', 'f', 'y', '3549', 'e', 'f', 'm', 't', '6281', '4241', '3415', 'z', 'g']
[EX A]: e, f, g, h, j, l, m, r, t, v, x, y, z

[EX Q]: ['p', '3817', '6755', 'b', '597', 'r', 'j', 'a', 'd', 'm', 'y', '3145', '4291', '3267', 'y', '4249', '4333', 'y', 'p', 's', 'm', 'z', '3881', 'b', 'r', 'n', '2935', 'f', '4079', '2121', '7121', 'a', 'm', 'x', '1149', '6741', '8131']
[EX A]:
a, b, d, f, j, m, n, p, r, s, x, y, z