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.

['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']
b, c, e, f

['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']
d, e, f, g, h, l, p, t, u, v

['7427', '2465', '3759', 'h', '2009', '7999', '4503', 'y', '1601', 'd', '427', 'z', '7379', '5289', '2327', '2075', 'x', 'q', 'j', '1111', 'z', 'c', '2031', 'z', '8507', 'r', 'f', 'i', '6145', '4437', 'y', 'q', 'k', 'b', 'u', 'f']

b, c, d, f, h, i, j, k, q, r, u, x, y, z