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]: ['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']
[EX A]: c, e, h, k, p, q, u, v, y

[EX Q]: ['1707', '381', '3957', '7853', '4987']
[EX A]: -1

[EX Q]: ['7969', '1351', '4165', 'f', '5619', 'w', 'j', '6729', '2003', '5687', 'z', 'c', 'n', 'f', '4443', '7023', 'z', 'x', 'o', 'm', 'p', '1719', '6021', '5619', '7923', 'h', '7405', '8237', '2627', '1641', 'p', 'r', 'c', '5221', '2283', 'a', '2373']
[EX A]:
a, c, f, h, j, m, n, o, p, r, w, x, z