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: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']

A: a, b, d, e, g, h, o, r, u, v, w, y, z
****
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: ['o', 'r', 'l', 'x', '5125', '3823', 'l', '639', '2809', 'i', 'o', 'j', '1919', 'n', '457', 'q', '3403', 'x', 'i', 'j', 'c', 'l', '2835', 'q', 'l', 'g', 'f', '9425', 'n', '4367', 'r', '4585', 'e', '6327', '6587', 'a', '905', 'p', '2827', 'z', 'n', 'u', '8521']

A:
a, c, e, f, g, i, j, l, n, o, p, q, r, u, x, z
****