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]: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']
[A]: c, d, g, i, j, k, n, o, q, r, s, t, y, z


[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]: ['8155', '3111', '1241', 'u', '223', 'e', 'o', 'r', 'q', 'y', '7197', '9077', '9627', '2539', '3177', '9669', 'p', '3481', '2483', 'p', '6451', 'p', '2367', 'd', '8339', '3311', '2799', '4645', 'x', '9825', 'p', 'c', '8913', '2327', '7715', '321']
[A]:
c, d, e, o, p, q, r, u, x, y