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: ['n', 't', '2901', '9697', 'a', 'j', 'x', 'a', '4437', '2255', '2177', 's', '3173', 'j', 't', '5713', '4091', '4253', '5553', 'i', '4533', 'i', 'e', '6899', 's', '3541', '2139', '2705', 'm', 'u']

A: a, e, i, j, m, n, s, t, u, x
****
Q: ['q', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']

A: b, c, d, e, l, n, o, q, r, w
****
Q: ['x', '8675', 't', 'x', 'f', 'b', 's', '6599', 'z', '5091', 'f', 'a', 'g', '2775', '9935', 'k', 'w', 'e', 'p', 'u', 'z', '2169', '299', 'k', '2361', 'a', '4909', '209', '6485', 'v', '7523', 'h', '7495', 'j', '5019', '2761', '7449', 'h', 'p', '9665']

A:
a, b, e, f, g, h, j, k, p, s, t, u, v, w, x, z
****