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.

['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
a, b, c, j, l, r, t, v, x

['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']
e, g, h, i, p, r, y

['d', '7307', 'x', 'l', 't', 'q', '7671', '1409', 'a', 'q', '3507', '8681', 'q', 'q', '4059', '127', '1955', 'r', 'g', '3055', '7937', 'z', '7277']

a, d, g, l, q, r, t, x, z