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]: ['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']
[A]: a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z


[Q]: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']
[A]: b, h, n, u


[Q]: ['5591', '8647', 't', 'q', '1797', '4085', '3709', 'o', 'd', 's', '869', '4541', '1093', '6063', 'u', 'j', '7935', '5607', 'a', 'r', '8433', '9409', 'm', '4025', 'w', '1947', 'n', '7887']
[A]:
a, d, j, m, n, o, q, r, s, t, u, w