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.

['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
a, j, l, q, y, z

['1197', '305', 's', '1113', 'n', '2207', 'e', '227', '2833', '607', '3049', 'v', '4615', 'a', 'k', 'r', 's', '3571', 'f', '4215', 'f', '8985', '5559', '4111', 'u', '1433', '1943', '8831', 'w', 'x', 'o', '9023', 'u', 'y', 'p', 's', 'h', '8877', 'p', 'n', '8903', '5811']
a, e, f, h, k, n, o, p, r, s, u, v, w, x, y

['f', 'w', 'k', '8083', '9971', '8829', 'b', 'd', '1319', '9045', 'a', 'n', 'x', '8481', 'c', 'x', 'i', '9739', '7213', 'n', '9157', 'j', '7731', '9355', '479', '1923', '9547']
a, b, c, d, f, i, j, k, n, w, x