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]: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
[EX A]: f, g, h, m, n, o, q, t, v, z

[EX Q]: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']
[EX A]: d, i, j, m, s, t, v, z

[EX Q]: ['p', 'z', 'x', '5669', 'e', '3085', '9947', '8899', '2211', '7189', '77', '6663', '5935', 'h', '7777', 'z', 'l', '4233', 't', 'r', '3123', 'l', 'h', '9017', 'd', 's', 'i', '791', '8569', '317', 'o', 't', '721', 's', '2785', 'f', '1529']
[EX A]:
d, e, f, h, i, l, o, p, r, s, t, x, z