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]: ['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
[EX A]: d, e, k, q, s, u, w

[EX Q]: ['3797', '6117', 'x']
[EX A]: x

[EX Q]: ['1433', '9613', 'h', '1299', '7661', 'd', '9029', 'r', 'j', 'k', '2915', 'q', '8995', '275', '3657', 'g', '219', 'x', 'q', 's', 'w', 'y', '6533', 'b', '9347', '545']
[EX A]:
b, d, g, h, j, k, q, r, s, w, x, y