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.

[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']
[A]: c, e, h, k, p, q, u, v, y


[Q]: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']
[A]: a, b, e, g, l, n, q, u


[Q]: ['e', 'q', 'd', '3327', 'z', '6645', 'm', 'p', '8691', 'e', 'n', 'j', '7071', 'a', '3479', 'x', 'c', '8077', '3905', 't', '3083', 'l', 'j', 'e', 'l', 'l', '165', '4665', '6167', 't', 'v', 'e', '9373', '429', 'f', 'o', '8189', 'm', 'g', '429']
[A]:
a, c, d, e, f, g, j, l, m, n, o, p, q, t, v, x, z