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:
['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']

Ex Output:
e, i, n, r, t, z


Ex Input:
['n', 'q', '6461', 's', '8565', '2237', '2071', '8143', '2977', '5511', 'j', 'o', '5793', 'j', 'm', 'n', '8031', 'j', '535', '5001', 's', 'y', '1737']

Ex Output:
j, m, n, o, q, s, y


Ex Input:
['h', 'z', 'i', '6953', 'y', '6281', '2655', 'x', 'e', 'a', '379', '2313', 'f', '551', 'o', 'n', 'v', '3385', 'f', '1317', '8201', '7235', '4407', 'c', '63', 'r', 'u', 'f', 'h', '8909', '883']

Ex Output:

a, c, e, f, h, i, n, o, r, u, v, x, y, z