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.

['d', '4377', '9271', '8053', '9519']
d

['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z

['w', '2831', '7069', 'o', 'a', '6967', 'r', 'e', '147', '425', '3815', '3349', 'g', '3383', '645', 'c', 'h', 'e', 'q', 'f', 'g', 'y', '3839', 'o', 'n', '4693', '2283', '3325', 'b', '4857', '4009', 'k', '1451', 'x', 'b', 'f', 'z', '159', '2565', '7845', 'd', '2769', '9629']

a, b, c, d, e, f, g, h, k, n, o, q, r, w, x, y, z