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.

['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
a, f, q, v, x

['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']
b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z

['9431', 's', '5847', '1169', '693', '7451', 'h', '9697', 't', '9027', 't', 'x', 'l', 'c', 'h', 'q', '5591', '7525', '7765', '5187', '5363', '871', 'm', 'm', 's', 'k', 's', 'o', '7913', 'k', 'e', '7517', '8597', '4481', 'z', '7601', 'c', 'r', '3243', 'w', '5793', '8511', '9713', 'l', '8823']

c, e, h, k, l, m, o, q, r, s, t, w, x, z