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


[Q]: ['8319', 'f', 'w', 'w', 'v', '6521', '4503', 'b', 's', 'b', '9651', 'k', '4635', '2195', '7537', '6839', 'i', 'd', 'b', '205', 'q', '7333', 'q', '5129', '4921', 's']
[A]: b, d, f, i, k, q, s, v, w


[Q]: ['g', 's', '8137', '8617', '1727', '8499', 'r', 'u', '8029', 'd', '3127', '6583', 'z', '4721']
[A]:
d, g, r, s, u, z