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]: ['9425', 'l', 'c', 'n', '5925', '2543', '3935', 'c', '7533', 'j', 'q', '3775', '5897', '9435', '69', 'e']
[EX A]: c, e, j, l, n, q

[EX Q]: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']
[EX A]: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z

[EX Q]: ['a', 't', '8981', '6799', '3171', 'd', '853', '8233', 'j', '1849', 't', '2313', '7165', '8615', '5689', '4373', 'k', '885', '25', 'h', '155', 'k', '8641', '8119', '4241', 'd', '657', 'o', 's']
[EX A]:
a, d, h, j, k, o, s, t