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

['7595', '5303', '3985', 'n', 'w', 's', 'r', 'f', '8237', 'q', 'y', 'f', '3121', '2463', '4597', 'q', '6801', 'f', 'i', '8563', '3267', 'k', '6157', 'f']
f, i, k, n, q, r, s, w, y

['8671', '9899', 'z', '1431', 'u', '3003', '1935', '1607', 'k', 'r', 'w', 'd', 'i', 'p', '4023', 'd', '8503', '4305', 'n', 'p', 'i', '7309', '5711', 'r', '3283', 'q', '6927', 'y', '9555', '8169', '8429', '8307', 'o']

d, i, k, n, o, p, q, r, u, w, y, z