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.

Ex Input:
['w', 'o', 'l', '1857', 's', 'q', 'j', 'e', '5945', 'g', 'l', '9563', 'e', 'u', '7633', '7977', '4943', 'y', '5621', 'f', '1653', 'c', 'l', '2843', '2125', '7731', '5257', '5667', 'b', 'b', '5765', 'a', 't', '8163', '9785', '5385']

Ex Output:
a, b, c, e, f, g, j, l, o, q, s, t, u, w, y


Ex Input:
['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']

Ex Output:
a, b, c, k, l, m, n, p, v, x


Ex Input:
['2311', '5663', '7593', '4093', '3601', 'i', 'b', 'w', 'k', 'v', '1257', '4129', '8317', '4413', 'b', 'm', '9635', 'j', 'v', 't', 'y', 'x', 'w', '5007', 'j', '8057', 'x', 'k', '6333', 's', 'm', 'j', 'd', 'w', '6025', '3817', 'e', 'm', '6369', 'f', 'r']

Ex Output:

b, d, e, f, i, j, k, m, r, s, t, v, w, x, y