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]: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']
[EX A]: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z

[EX Q]: ['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']
[EX A]: e, i, n, r, t, z

[EX Q]: ['s', '4285', '5729', 'b', '3675', '8999', 'c', 'f', 'y', 's', 'd', '1389', 'p', 'l', 'k', '653', '561', 'k', '9195', 'm', '5073', 'e', 'q', 'u', 'x', '9031', '7413', '8875', 'r', 'i', 'h', '3223', '5533', '949', '7075', 'b']
[EX A]:
b, c, d, e, f, h, i, k, l, m, p, q, r, s, u, x, y