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]: ['d', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']
[EX A]: b, c, d, e, k, n, s, u, v, w

[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]: ['6609', 'f', 'y', 'y', 'z', '4797', 'n', '7171', '5107', '3187', 's', 'i', 'c', '343', '3861', 't', '2527', '7577', 'l', 'q']
[EX A]:
c, f, i, l, n, q, s, t, y, z