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: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']

A: b, c, d, e, f, h, i, l, m, o, p, q, r, t
****
Q: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']

A: j, l, n, q, r, s, y
****
Q: ['7819', '4605', 'v', '5039', 'd', 's', 'd', '5143', '4021', '2977', 'g', '8425', '159', '5561', 'u', '3857', '2925', '3329', '7091', 'k', '9135', '121', 'z', '8769', 't', '4423', '2699', 'm', 't', 'd', '2803']

A:
d, g, k, m, s, t, u, v, z
****