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]: ['r', '4655', 'm', 'l', '4371', 'o', '5331', '5469', 'j', 'u', '4915', 'v', 'i', 'f', 'j', '6139', 'y', '2423', '1271', '2289', '5565', '7561', '9697', 'e', 's', 'u', '9581', 'y', '6095', '5047', '625', '9047', 'd', 's', '8307', '3615', '8145']
[A]: d, e, f, i, j, l, m, o, r, s, u, v, y


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


[Q]: ['9937', '9217', '3945', '405', 'u', '6717', 'w', 'o', 't', '2771', '6773', '3039', '1755', '1425', 'g', 's', '2181', '8975', 'p', 'm', 'f', 'a', 'm', '1207', '4471', '1759', '979', '8677', '4153', 'y', 'm', 'o', 's', '2983', '3437']
[A]:
a, f, g, m, o, p, s, t, u, w, y