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.

['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']
a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z

['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']
a, l, m, p, v, w, y

['5347', 'm', '6489', 'y', '3595', 'i', 'o', '3713', '2703', 'd', '407', '2725', 'm', 'g', 'c', 'v', '4629', 'd', '5775', 'a', '6665', 'y', '5209', '6891']

a, c, d, g, i, m, o, v, y