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.

['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']
d, g, h, k, l, m, n, q, t

['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']
b, d, f, j, k, n, o, q, r, u, z

['8779', '5575', '5739', 'i', '7177', '3093', 'p', 'v', '7825', '1041', '4609', 'm', '6517', 'x', '4341', '2225', 'c', 'b', '6839', 'c', '6267', 'c', 'k', '1893', 't', 'e', 'z', '5509', 'f', 'p']

b, c, e, f, i, k, m, p, t, v, x, z