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]: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']
[EX A]: d, e, f, j, k, r, u, v, w, x, z

[EX Q]: ['1121', 'j', '1433', 'g', 'l', '1479', '1699', 'j', 'a', '8507', 'd', 'a', '5229', 'k', 'x', '4549', 'e', 'p', '1367', 'u', 'd', '785', '215', 'e', 'f', 'a', '101', '7575', '7965', 'p', 'i', '5637', '1005', 'i', 'y', '181', 'r']
[EX A]: a, d, e, f, g, i, j, k, l, p, r, u, x, y

[EX Q]: ['g', 'k', 'v', '8453', '3647', '9957', 'i', 'e', '6983', 'j', '9445', '1195', '5101', '9125', '9367', '5933', '6699', '4267', '9143', 'k', 'c', '4731', '9787', '3377', 'j', 'f', 'f', '8079', '5813', 'a', 'b', '9023', '1005', 'm']
[EX A]:
a, b, c, e, f, g, i, j, k, m, v