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]: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
[EX A]: a, f, q, v, x

[EX Q]: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']
[EX A]: a, e, h, l, n, o, q, u, v, y

[EX Q]: ['8439', 'v', 'o', 'k', '5517', 'k', 'n', '2577', '7777', 'f', '87', 'p', 'p', '693', 'h', 't', 'q', '3787', 'p', '9791', 'd', 'a', 'w', '9147', 'z', '1185', 'b', 'b', 't', '939', 'y', '217', 'v', '5065', 'p']
[EX A]:
a, b, d, f, h, k, n, o, p, q, t, v, w, y, z