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]: ['1971', 'g', 't', 't', 'x', 'q', 'o', 'm', 'h', '9481', '1729', '5527', 'u', '3157', 's', '8795', 'z', 'g', 'i', '1649', 'p', '65', 's', 'u', '6843', 'r', 'l', 'k', 'n', 's', 'm', '7991', 'u', 'a']
[A]: a, g, h, i, k, l, m, n, o, p, q, r, s, t, u, x, z


[Q]: ['9705', '5899', 'r', '6845', 'b', '9391', '3701', 'v', '2961', 'c', 'w', '6129', '8149', 's', 'g', '5015', 'v', '1147', 'u', 'w', '9309', '4769', '1193', '5975', 'v', 'y', '8001', '3187', 'u']
[A]:
b, c, g, r, s, u, v, w, y