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: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

A: d, e
****
Q: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']

A: a, d, f, h, i, j, k, m, o, p, q, s, t, y
****
Q: ['y', '6821', '1853', '7583', 'i', '3539', '8423']

A:
i, y
****