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: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']

A: b, d, f, i, k, l, q, s, t, u, v, w, x, y
****
Q: ['1983', '1835', '6543', '6399', '4177', '9385', '7127', 'p', 'l', 'u', 'g', 't', '3423', 'g', 'b', 'l', '3133', '2429']

A: b, g, l, p, t, u
****
Q: ['v', 'm', 'n', 'r', 'g', '5495', '2847', 'y', 'l', 'r', '3685', 'e', 't', 'y', '4473', 'v', '143', 'o', '9717', '7421']

A:
e, g, l, m, n, o, r, t, v, y
****