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]: ['t', 'x', '1699', '8727']
[A]: t, 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]: ['m', '5995', '2933', '561', '6889', '775', 'g', 'v', 'h', '6771', '6881', '2451', 'z']
[A]:
g, h, m, v, z