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]: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
[EX A]: d, e, k, l, o, s, t, u, w, y

[EX Q]: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']
[EX A]: e, k, l, m, n, v, z

[EX Q]: ['u', 'q', '4115', '105', '6367', 'f', 'w', '5599', '2201', '7341', 'y', 'd', 'x']
[EX A]:
d, f, q, u, w, x, y