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:
['s', 's', '6581', 'e', '7355', '1315']

Ex Output:
e, s


Ex Input:
['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']

Ex Output:
b, d, e, f, n, o, p, q, r, v, w, z


Ex Input:
['j', '4405', 'z', '9965', '641', '6837', '997', '7463', '8993', '8495', 'f', '1041', '8951', 'e', 'z', 'q', '8575', 'i', 'l', 'j', 'i', 'x']

Ex Output:

e, f, i, j, l, q, x, z