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]: ['q', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']
[EX A]: a, c, e, g, h, i, l, m, p, q, t, v, w, x, y

[EX Q]: ['8723', 'b', '2543', 'j', '7795', '7259', 't', '9321', 'h', '7821', '157', 'b', '9591', 'x', '7753', '3809', '5', '7015', 'w', '9055', 'x', 'h', 'w']
[EX A]:
b, h, j, t, w, x