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.

['2293', 'p', '9787', '7241', '8689', 'u', '3141', 'h', 'c', 'b', 'f', 's', '319', 'c', 'p', '6909', 'p', 'f', '1717', 'd', '2285', 's']
b, c, d, f, h, p, s, u

['c', '8389', 'j', '6113', '5843', 'f']
c, f, j

['9199', 'x', 'v', 'n', 't', 'i', 'u', '5669', 'a', '249', 'r', '5191', '3743', '9711', 'w', 'n', '9629', 'q', 'b', 'e', 'c', 'u', '271', 'q', '8653', 'b', '6941', 'r', '3907', '9973', '1841', '2621', 'q', '8563', '3829', 'x', '8621', '6009', '3291', '2703', '7399']

a, b, c, e, i, n, q, r, t, u, v, w, x