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]: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']
[EX A]: e, f, j, n, p, r, w, z

[EX Q]: ['4045', '4739', 'd', 'e', '6789', 'e', 'q', '4909', '9511', 'h', '9543', '6725', 'a', '3683', 'q', 'k', 'd', 'q', 'z', 'b', '3245', '9877', '9155', '7751', 'e', '1015', '2379', 'f', 'y', '1121', '9801', 'c', 'h', 'l', 'f', '67', 'v', 'v', 'y', 'c', '3871', 'v', '5893', 'a']
[EX A]: a, b, c, d, e, f, h, k, l, q, v, y, z

[EX Q]: ['6895', 'q', '2897', 'a', 'v', 'c', '1507', '4647', '9569', '133', '3665', 'v', 'u', '6235', '7109', 'v', 'n', '3285', '5359', '9913', '5883', 'c', '5445', 'a', '9605', 'z', 'x', '1283', 'a', '7887', 'h']
[EX A]:
a, c, h, n, q, u, v, x, z