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.

Input: Consider Input: ['1197', '305', 's', '1113', 'n', '2207', 'e', '227', '2833', '607', '3049', 'v', '4615', 'a', 'k', 'r', 's', '3571', 'f', '4215', 'f', '8985', '5559', '4111', 'u', '1433', '1943', '8831', 'w', 'x', 'o', '9023', 'u', 'y', 'p', 's', 'h', '8877', 'p', 'n', '8903', '5811']

Output: a, e, f, h, k, n, o, p, r, s, u, v, w, x, y


Input: Consider Input: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']

Output: d, e, g, l, n, p, s, t, x


Input: Consider Input: ['7841', '2755', '8709', '1715', 'e', 'd', '6523', '6975', 'h', 's', 'x', 'k', '9837', 'u', 's', '3485', 'v', '6063', '611', '8037', '5201', 'j', '4405']


Output: d, e, h, j, k, s, u, v, x