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]: ['d', 'g', '9019', '9987', '8713', '9513', 'a', '2043', 'd', '5817', 'w', 'd']
[A]: a, d, g, w


[Q]: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']
[A]: b, d, f, h, p, t, u, w, x, y, z


[Q]: ['n', 'a', '8787', 'q', 'q', 'q', 'b', '2165', '9137', 'c', 'o', '2395', 'f', 'x', '2825', 'v']
[A]:
a, b, c, f, n, o, q, v, x