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:
['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']

Ex Output:
d, e, f, h, i, k, m, n, q, r, s, t, z


Ex Input:
['e', 'z', '5199', 'x']

Ex Output:
e, x, z


Ex Input:
['9677', 'a', '6601', '7195', '8187', 'q', 'u', 'g', 'a', 'p', '903', 'n', '6983', 's', '2745', '9447', '5395', '4401', 'y', '2205', 's', '3779', '597', '9561', 'o', 'g', 'x', 'w', 'y', '4471', '8203', '7923', 'm', '2241', 't', 'p', 'g', 'x', 't']

Ex Output:

a, g, m, n, o, p, q, s, t, u, w, x, y