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.

[EX Q]: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']
[EX A]: a, g, h, k, m, p, q, r, v

[EX Q]: ['t', 'm', '7071', 'j', '353', 'n', 'a', 'm', '9211', 'i', '9537', 'q', '7669', '869', '8753', '8071', '375', '9971', 'c', 'n', '5851', 'u', '2491', '2697', '2789', '4683', '879', 'q', 'g', 'p', 'd', 'x', 'r', 'i', '8171', '5449', '2477', '1151', 'z', '3845', '1079', 'j', 'n', 'p', '8199']
[EX A]: a, c, d, g, i, j, m, n, p, q, r, t, u, x, z

[EX Q]: ['4941', 'r', 'e', '6665', '6091', '2343', 'g', 'l', '1141', 'e', '9415', 'v', '1433', '2375', '9315', 's', 'y', '9817', '6523', 'l', '4971', 'w', 's', '857', 'n', '9459', 'v', '2593', 'a', '6847', '8977', 't', '8553', '8225', 'h', '8231', 'x', '1895', '7395', 's', '6653', '9997', 'u', 'l']
[EX A]:
a, e, g, h, l, n, r, s, t, u, v, w, x, y