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:
['o', 'z', 'h', '3965', 'n', '3009', '173', '997', '3987', '5799', '2331', 'p', 'x', '897', '8213', '451', 'u', 't', 't', '9917', '4501', 't', 'c', 'i', 'w', 'w', 'u', '2977', 't', 'b', '4161', '9281', 'w', 'f', '3137', '5745', 'e', '673', '6363', 'h', 'q', 'x', 'm', '9505']

Ex Output:
b, c, e, f, h, i, m, n, o, p, q, t, u, w, x, z


Ex Input:
['m', '5473', '1997', '7627', 'z', 'e', 'j', 'q', '4345', 'b', 'd', 'e', '7411', '741']

Ex Output:

b, d, e, j, m, q, z