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]: ['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']
[EX A]: e, f, i, o, q, t, v, w, y

[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]: ['n', '5053', 'h', 'f', '6349', 'j', '8273', '7877', 'j', 'a', '4787', 'm', 'o', 'v', 'k', 'd', '451', 'l']
[EX A]:
a, d, f, h, j, k, l, m, n, o, v