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', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']

A: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y
****
Q: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']

A: g, i, k, l, m, n, o, p, t, u, w, y
****
Q: ['r', 'w', 'w', '4887', 'o', '319', 'o', '5397', 'e', 'o', 'f', 'y', 'd', '5829', '4857', 'q', 'l', 'i', '9699', 'u', 'm']

A:
d, e, f, i, l, m, o, q, r, u, w, y
****