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.

['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']
d, h, i, j, k, n, o, t, v, w, x, z

['815', '6967', '6553', 'r', 'y', '3641', 'q', 'b', '6131', '4289', 'w', '6093', '6055', 'i', 'b', 'y', '5107', 'v', 'g', '9709', 'x', 'i']
b, g, i, q, r, v, w, x, y

['t', 'p', '7673', '6065', '617', '2187', 'k', '6487', '6427', 'd', '3017', 'm', 'w', '4823', 'u', '2351', '4585', '7389', 'c', '8427', '8935', '9169', 'h', '69', '6989', '4825', '1697', 'e', '691', '3661', '5749', 'u', 'i', '3711', 'v']

c, d, e, h, i, k, m, p, t, u, v, w