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]: ['8975', '7199']
[A]: -1


[Q]: ['5159', '6407', '4021', '6655', 'c', 'k', 'w', '7191', 'l', '4321', '1609', 'm', '1991', '9261', '511', 'p', '7495', 'b', 'e', '4647', '2711', 'd', 'y', '3835', '5037', '3613', '2695', '3367', 'm', 'j', 'y', '9561', '4889', 'a', 'z', '2253', 'p', 't', 's', '8371', '2859', 's']
[A]: a, b, c, d, e, j, k, l, m, p, s, t, w, y, z


[Q]: ['x', '5343', '5935', 'd', '13', 'i', '3737', 'q', 'w', '9173', '1023', '4825', 'f', 'h', '7439', 'i', '8137', 'j', 'm', 'i', 'p', '653', 'w', '4985', '7113', 'w', '3085']
[A]:
d, f, h, i, j, m, p, q, w, x