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', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']
b, c, d, e, l, n, o, q, r, w

['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']
a, b, e, j, l, n, p, r, t, u, w, x, y, z

['7871', 'i', '1029', 'w', 'e', '7481', 'k', 'q', '7005', '4277', 'h', '5191', 'b', 'a', 'z', '6259', 'q', 'u', 'i', 'e', 'l', 'h']

a, b, e, h, i, k, l, q, u, w, z