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: ['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: ['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']

A: a, b, c, e, f, g, j, l, o, q, s, t, u, w, y
****
Q: ['i', 'n', '6247', 'd', '1799', 'j', '2851', 'w', '3693', 'n', 't', 'b', '8195', 'd', '6109', 'x', 'y', 's', 'o']

A:
b, d, i, j, n, o, s, t, w, x, y
****