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]: ['895', '2049', '8839', '1773', 'v', '467']
[EX A]: v

[EX Q]: ['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']
[EX A]: b, d, e, f, n, o, p, q, r, v, w, z

[EX Q]: ['u', 'i', '5741', 'x']
[EX A]:
i, u, x