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.

['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']
b, q, t, u, x, y

['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']
d, e, j, l, n, p, q, s, t, w

['8563', 'y', 'g', '6173', 'o', 'w']

g, o, w, y