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: ['1801', 'q', '5101', '8863', '2309', 'p', '8789', '9529', '6135', '5523', 'f', '8889', '7639', 'k', '263', '5751', '5529', 'g', '1451', '4143', 'e', '6987']

A: e, f, g, k, p, q
****
Q: ['p', '6123', '6961', 't', 'p', 'h', '9035', 'r', '6341', 'x', '3635', '5885', 't', '3543', '9567', '1787', 'o', '2991', 'k', '3441', '4091', 'a', 'r', '423', '9383', '7147', 'h', '663', 'd']

A: a, d, h, k, o, p, r, t, x
****
Q: ['7231', '8473', 'p', '2229', 'j', '8863', '4647', 'l', '4981', 'o', '6727', 'w', '2541', '5331', '765', '91', 'a', '2623', 'b', 'm', '8963', '3183', 'n', '8683', '9601', '8705', 'l', '3909', '9621', '4405', 'h', '3457', 'w', '7081', '4207', 'c', '5517', '4471', 'h', 'z']

A:
a, b, c, h, j, l, m, n, o, p, w, z
****