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]: ['t', 't', 'p', '3245', 'x', 'g', 'i', 'u', '2599', '8613', 't', 'v', 'p', '5635', 'y', '9567', '5193', '8617', 'q', 'f']
[EX A]: f, g, i, p, q, t, u, v, x, y

[EX Q]: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']
[EX A]: e, g, h, i, p, r, y

[EX Q]: ['6507', 'i', '615', '9189', 'z', '9137', '8823', '8289', 'n', '8187', '5079', 'g', '2451', '3203', '4819', 'p', '8297', '5795', 'd']
[EX A]:
d, g, i, n, p, z