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]: ['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]: ['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']
[EX A]: a, n, u

[EX Q]: ['k', 'e', '1671', 'b', '2799', '2575', 'h', '8085', 'x', 'c', '2401', 'v', '4779', '5997', 'q', '5709', 'x', 'p']
[EX A]:
b, c, e, h, k, p, q, v, x