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]: ['k', '1995', 'b', '2581', 'x', '2639', 'i', '6761', '2701', 'd', '6993', '9375', 'r', 'm', '249', '8115', '8179', 't', '4901', 'i', '6197', '2809', 'e', 's', 'j', '4261', 'f', '6649', '7527', '3839', '5651', '9287', 'n', '2505', 's', 'q', '2825', 'g']
[EX A]: b, d, e, f, g, i, j, k, m, n, q, r, s, t, x

[EX Q]: ['6495', '2259', '8213', 'm', 'y', '3377', 'q', 'i', '1299', 's', 'w', '4331', 'h', '5459', '4059', '6637', '8069', '5367', '6025', 'l', 'v', '4503', 'd', 'x', 'w', '5067', '9019', 'd', '7919', '7299', 'v', '8957', 'v', '5341', '2617', '8169', 'n', 'y']
[EX A]: d, h, i, l, m, n, q, s, v, w, x, y

[EX Q]: ['9001', '8809', 't', '1871', 'b', '4259', 'f', 'j', 'l', 'e', '2475', 't', '181', 'a', 'r', 'w', 'k', 'h', 'z', '8133', 'f', '4227', 'e', 'x', 't', '4977', '7225', 'p', '5399', '7433', 'r', 'd', '8561', '6197', '9963', '3035', 'q', '5031', '2647', '8297', '2735', 'i']
[EX A]:
a, b, d, e, f, h, i, j, k, l, p, q, r, t, w, x, z