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]: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
[EX A]: e, f, g, h, k, q, u, z

[EX Q]: ['3561', 'd', '9697', 'd', '7761', 'a', '2833', 'c', '2921', 't', '691', 'g', '4797', 'b', '3913', 'f', 'q', '7807', 'j', '3577', 'j', '1775', '2897', '2589', '993', '8595']
[EX A]: a, b, c, d, f, g, j, q, t

[EX Q]: ['x', '8151', 'k', '8979', 't', '3113', '8795', 'w', '3553', '6855', 'b', '4167', 'l', 'n', 'p', 'h', 'g', 'h', 's', 'c', 'l', '5175', 'v', '1691', '6377', 'l', '5735', '7775', '5901', '8271', 'i', '7163']
[EX A]:
b, c, g, h, i, k, l, n, p, s, t, v, w, x