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.

['o', 'z', 'h', '3965', 'n', '3009', '173', '997', '3987', '5799', '2331', 'p', 'x', '897', '8213', '451', 'u', 't', 't', '9917', '4501', 't', 'c', 'i', 'w', 'w', 'u', '2977', 't', 'b', '4161', '9281', 'w', 'f', '3137', '5745', 'e', '673', '6363', 'h', 'q', 'x', 'm', '9505']
b, c, e, f, h, i, m, n, o, p, q, t, u, w, x, z

['o', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']
c, e, f, m, o

['s', 'j', 'x', '4197', '8711', '957', 's', 's', '3777', '5181', '5437', '701', 'd', '4841']

d, j, s, x