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:
['9689', '9727', 't', 'd', '2103', 'c', 'n', '8553', '4559', '7815', 'u', 'l', 'c', 'e', 'u', 'n', '7207', '4875', '7699', 'h']

Ex Output:
c, d, e, h, l, n, t, u


Ex Input:
['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']

Ex Output:
d, e, k, l, o, s, t, u, w, y


Ex Input:
['h', '7367', 'o', '4073', '3941', 'b', '8339', '4045', 'g', 'z', 'q', 'v', '2123', '4207', '9831', 'z', 'q', 'v', '5149', 'a', '4793', '9863', '7677', '5237', '7507', 't', '9939', 'l', 'c', 'j', '8657', '8175', '5489', 'f', '8057', 'i', '8453']

Ex Output:

a, b, c, f, g, h, i, j, l, o, q, t, v, z