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.

['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']
d, h, q

['j', '8797', 'i', '5443', 'i', 'f', '7593', 'u', 'h', '3251', 'l', '681', 'y', 'n', 'r', '1699', '1379', '8987', '6955', 'x', 'p', 'x', '553', 'q', '5679', 'q', 'w', '9007', 'r', '8945', '7351', 'a', 'v', 'k', '1309', 'v', 'i', '4161', 'a', 'q', '2919', '6917', '6845']
a, f, h, i, j, k, l, n, p, q, r, u, v, w, x, y

['9523', '89', 'f', 'w', '9803', '1453', '4435', 'l', '5499', 'c', 'i', 'j', 'l', 't', '6665', 's', 'j', 'r', 'n', 'f', 'c', 'n', 'm', 'n', '6203', '6739', '7745', '5369', '2431']

c, f, i, j, l, m, n, r, s, t, w