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', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
[EX A]: d, e, h, k, l, n, o, q, r, u, z

[EX Q]: ['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']
[EX A]: b, c, e, f

[EX Q]: ['8777', 'd', 'k', 'j', '4383', 'w', '2797', 'b', '9873', '8989', 'b', '7191', '3233', 'v', 'i', '7053', '2239', 'h', 'l']
[EX A]:
b, d, h, i, j, k, l, v, w