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:
['q', 'h', 'q', '7185', 'f', 'l', 'r', '3605', 'x', 'i', 'v', '8789', 'u', 'x', 'x', '8315', 'x', 't', 'h', 'o', '4943', '5827', '7677']

Ex Output:
f, h, i, l, o, q, r, t, u, v, x


Ex Input:
['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']

Ex Output:
c, h, k, m, n, r


Ex Input:
['6997', 's', 'm', '3921', 'u', 'z', '6703', 'y', '637', 'g', '6141', 'g', 'h', '8479', '3193', '7483', '1309', 'd', '4591', '4399', 't', '4519', '6169', '6625']

Ex Output:

d, g, h, m, s, t, u, y, z