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.

['2819', 'k', 'u', 'a', '4575', 'a', 't', 'a', 'f', '1507', '415', 'w', 'o', 'o']
a, f, k, o, t, u, w

['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']
a, c, d, e, f, h, i, j, n, q, s, u, v, y

['o', '8223', '6243', 'j', '3527', 'o', '5211', 'a', 'c', '3793', 't', '6485', '7195', 'i', '1209', 'j', '7921', '2331', 'k', 'q', '2457', '3451', '6379', 'r', 'r', '3393', '7685', '6491', 'u', 'x', 'w', 'q', '6343', 'v', '3449', 'p', '115', '5077', '1057', '4563', '2261', '5225']

a, c, i, j, k, o, p, q, r, t, u, v, w, x