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: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']

A: c, f, i, k, n, o, p, s, u, w, y, z
****
Q: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']

A: c, j, q, v
****
Q: ['5135', 'k', 'l', '3919', 'o', 'w', '253', '3979', '3235', '7233', 'a', '6907', '465', 't', 'h']

A:
a, h, k, l, o, t, w
****