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]: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']
[A]: a, d, f, h, i, j, k, m, o, p, q, s, t, y


[Q]: ['w', '6291', '3939', '9569', 'u', '1635', '3359', '8335', 'n', '2799', '7359', 'k', 'm', '2817']
[A]: k, m, n, u, w


[Q]: ['3923', 'c', 'x', 'i', '2003', '5929', 'l', 'u', '5647', 'a', '563', '1023', '5113', '8309', 'v']
[A]:
a, c, i, l, u, v, x