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]: ['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]: ['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]: ['j', 'a', '117', '5223', '8239', '7513', '1677', 'c', '977', '5129', 'b', 'd', '1675', '2845', 'l', 'a', 'd', 'x']
[EX A]:
a, b, c, d, j, l, x