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]: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']
[A]: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z


[Q]: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']
[A]: i, j, o, w


[Q]: ['a', 'c', 'u', 'z', 'n', 'x', 'v', '8131', 'c', 'e', 'i', 'i', '2979', '6795', '2561', 'w', 'q', 'z', '1251', '515', 'd', '8559', '6725', '5259', 'u', '6465']
[A]:
a, c, d, e, i, n, q, u, v, w, x, z