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:
['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']

Ex Output:
b, d, e, g, h, i, j, w, y


Ex Input:
['1233', '405', '8901', '7147', '8841', 's', 'v', '3131', 'p', 'd', 'y', '5873', '439']

Ex Output:
d, p, s, v, y


Ex Input:
['w', '6041', 'i', '2439', 'm', '7643', '8473', 'x', 'u', 'g', 'c', '1795', 'y', 'i', '2551', 'h', 'h', 'r', '4897', 'r', 't', '5781', '391', 'q', 'n', 'p', 't', '4253', '2201', '8891', 'e', 'b', '4283', 't', 'w', '7361']

Ex Output:

b, c, e, g, h, i, m, n, p, q, r, t, u, w, x, y