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]: ['887', 'p', '3819', '2727', '1407', 'b', 'n', '737', 'd', 'w', 'q', '6877']
[EX A]: b, d, n, p, q, w

[EX Q]: ['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']
[EX A]: b, e, g, h, k, m, q, u, w, y

[EX Q]: ['6775', '4729', 'q', '9091', 'z', 's', 'p', '2427', 'e', '8973', 'w', '1243', 'c', 'k', 'z', 'h', 'm']
[EX A]:
c, e, h, k, m, p, q, s, w, z