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:
['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']

Ex Output:
b, e, g, h, k, m, q, u, w, y


Ex Input:
['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']

Ex Output:
a, b, c, f, g, h, j, k, p, r, v, w, x, y


Ex Input:
['3843', 'v', 'b', 'l', 'z', '1789', 'n', 'x', 'g', '2025', 'b', 't', '1003', '2065', 't', 'v', 'y', '5873', '4051', '1605', '1195', 'n', 'r', 'f', 'l', 'v', '8247', 'r', '5973', '4915', 'y', 'f', '5277', 'p', '5017', 'n', '9983', '4269', '2793', '5737', 'r', '2077']

Ex Output:

b, f, g, l, n, p, r, t, v, x, y, z