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]: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
[A]: a, d, h, i, j, m, n, p, y


[Q]: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']
[A]: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


[Q]: ['4625', '119', 'g', 'y', '2689', '5963', '1315', 'o', 'b', '4967', '4649', 'v', '2175', 'm', '5751', 'd', '513']
[A]:
b, d, g, m, o, v, y