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: ['r', 's', '2471', 'n', '635', 'k', '3551', '7041', '8765', '1221', '8439', '7773', '6471', 'u', 'p', '2093', '6479', '1435', '6881', 'a', 'y', 'm', 'r', '1627', 'w', 'k', 'b', '3095', '9059', '285', 'y', 'a', 'm', 'x', '637', 'i', '3407', 'e', 'e']

A: a, b, e, i, k, m, n, p, r, s, u, w, x, y
****
Q: ['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']

A: c, f, h, p, s
****
Q: ['q', 'e', 'j', 'n']

A:
e, j, n, q
****