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]: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
[A]: c, h, l, u, x


[Q]: ['d', 'm', 'k', '3513', '8241', '5541', 'm', 's', '1993', '6163', '2753', 'd', 'b', 'm', 'i', '7647', '8631', '9119', '2165', 'x', '3911', '2769', '1673', '7195', 't', 'w', '5555', 'o', '3265']
[A]: b, d, i, k, m, o, s, t, w, x


[Q]: ['j', '3085', '1989', 'w', '8843', '4983', '4637', '7863', '5699', '37', '2845', '241', '3405', '1091', '2027', '5523', '6335', '2539', 'x', '6903', 'l', 'c', '2033', 'y', '1625', 'n', '941', '1649', '2875', 't', '9177', '1869', 'i', '2859', '1651', 'c', '395', 'n', 'a', 'x', '4073']
[A]:
a, c, i, j, l, n, t, w, x, y