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]: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']
[A]: b, h, i, m, r, u, y, z


[Q]: ['8887', '1199', 'r', '7209', 'k', '7567', '7239', 'k', '5123', 'w', '4523', 't', 'd', '5289', '5737', '485', 'w', 't', '7651', 'v', '7213', '7687', 'y', 'w', '7265', 'b', 'b', '3667', 'z', '9935', 'i', 'l', 'u', '6715', 'j', '9815', '8925', '7941', 'w', 'm', '3907', '621', '5523', '5849']
[A]: b, d, i, j, k, l, m, r, t, u, v, w, y, z


[Q]: ['d', '2509', '4783', 'p', '7621', 'p', 'o', 'x', 'v', 'y', 'p', 'f', 'j', 'z', 'b', '7177', 'b', 'z', 'c', '2315', 'k', 'q', 'f', 'x', 'i', '187', 'w']
[A]:
b, c, d, f, i, j, k, o, p, q, v, w, x, y, z