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:
['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']

Ex Output:
a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z


Ex Input:
['7441', '7967', '2011', '1383', 'i', '3623', 'b', 'y', 'e', '1593', 'r', 'a', 'd', 'b', '6159', '3931', '989', '435', 'o', 'y', 'j', 'w', '7669', 'y', '5781', 'u', '531', '7467', '3971', '8139', 'w', 'a', '5113', '9461', '8377', '7431', '6975', '6055', '7307', 'v']

Ex Output:
a, b, d, e, i, j, o, r, u, v, w, y


Ex Input:
['h', '4421', 'w', 'x', '4679', '4383', 'g', 'k', 'c', '6883', 'a', '6873', '3589', '9151', '3285', 'z', '1981', '3399', '6977', '1981', 'm', 'h', '1661', '9903', 'f', '673', 'y', '5251', '1919', '6959', '875', '3557', 'r', 'k', 'u', '4177', 'o', 'y', '3025', '6211', 'l', '6687']

Ex Output:

a, c, f, g, h, k, l, m, o, r, u, w, x, y, z