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]: ['w', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']
[A]: a, b, c, g, h, i, m, o, u, v, w, x, y


[Q]: ['p', 'p', '7899', 'u', '971', '7289', 't', '5217', 'k', 'z', 'y', 'y', '6905', '9499', '4085', 'x', '955', 'v', 'j', '9049', '7927', '1757', '193', '2181']
[A]: j, k, p, t, u, v, x, y, z


[Q]: ['715', '9653', 'e', 'j', 'o', '8439', 'b', '2421', '637', '647', 'b', 't', 'd', 'q', '2557', 'n', '8333', '1241', 'p', 'n', '9357']
[A]:
b, d, e, j, n, o, p, q, t