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]: ['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
[EX A]: f, i, k, n, q, r, s, w, y

[EX Q]: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']
[EX A]: d, e, g, h, i, m, t, u, v, x, y

[EX Q]: ['y', 'k', '6335', '5505', '7261', 'v', '307', '9475', '387', 'b', '915', '1923', '2023', '1657', 'x']
[EX A]:
b, k, v, x, y