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]: ['7441', '7967', '2011', '1383', 'i', '3623', 'b', 'y', 'e', '1593', 'r', 'a', 'd', 'b', '6159', '3931', '989', '435', 'o', 'y', 'j', 'w', '7669', 'y', '5781', 'u', '531', '7467', '3971', '8139', 'w', 'a', '5113', '9461', '8377', '7431', '6975', '6055', '7307', 'v']
[EX A]: a, b, d, e, i, j, o, r, u, v, w, y

[EX Q]: ['9013', 'e', 'm', 'p', 'k', '161', 'k']
[EX A]: e, k, m, p

[EX Q]: ['7571', '9443', 'c', '9323', '6419', '3273', 's', '6499', '1757', 'o', 'j', 'p', 'c', 'p', 't', '6893', '3099', 'o', 'j', '4979', 'q', '7113']
[EX A]:
c, j, o, p, q, s, t