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]: ['j', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']
[A]: c, h, j, k, m, p, r, t, w, x, y, z


[Q]: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
[A]: d, e, h, i, l, m, o, p, q, r, v


[Q]: ['o', 'i', '8985', '7193', 'e', 'o', '5205', 'v', '1281', 'x', '6585', '8457', 'e', 'f', 'r', 'k', 'l', 'm', '7405', 'u', '8319', '7887', '821', '7419', '1393', '5497', '4449', '2417', '9375', 'a', 'u', '5765', '1991', 'a', '4397', 'z', 'x']
[A]:
a, e, f, i, k, l, m, o, r, u, v, x, z