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]: ['2819', 'k', 'u', 'a', '4575', 'a', 't', 'a', 'f', '1507', '415', 'w', 'o', 'o']
[A]: a, f, k, o, t, u, w


[Q]: ['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']
[A]: a, b, e, h, l, q, s, y, z


[Q]: ['181', '6915', 'n', 'b', '4795', 'e', 'x', 'z', 'm', 'h', 'a', 'w', 'a', '7897', '1871', '9341', '7111', '7307', 'h', '5499', '2185', 'y', 'l', '3941', 's', '385', '121', 'n', 'u', '491', '777', '1357', 'h', 'p', 'z', '293', 'z']
[A]:
a, b, e, h, l, m, n, p, s, u, w, x, y, z