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:
['c', '8389', 'j', '6113', '5843', 'f']

Ex Output:
c, f, j


Ex Input:
['h', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']

Ex Output:
h, i, l, m, n, r, u, x, z


Ex Input:
['d', '207', 'k', '4499', 'o', '4597', 't', '5561', 'c', 'q', '4097', '6657', '455', '7123', '2735', '7091', 'j', 'e', 't', '167', '2777', '5307', 'f', '6531', 'y', '5321', 'v', 's', 'q', '7203', '3907', 'w', '2823']

Ex Output:

c, d, e, f, j, k, o, q, s, t, v, w, y