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.

['1983', '1835', '6543', '6399', '4177', '9385', '7127', 'p', 'l', 'u', 'g', 't', '3423', 'g', 'b', 'l', '3133', '2429']
b, g, l, p, t, u

['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']
a, b, e, f, g, h, i, j, k, n, p, r, u, y

['9269', '8001', 'd', 'f', '5633', 'q', '4761', 'v', 'x', 'g', '7963', '111', 'i', 'h', '7543', 'f', '5317', 'l', '7697', 'b', '7349', '2661', '7841', 's', 's', '7005', '59', 'o', 'r', '8605', '9839', '5545', '8357']

b, d, f, g, h, i, l, o, q, r, s, v, x