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.

['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
e, f, i, j, r, s, u, v, w

['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']
b, d, f, i, k, l, q, s, t, u, v, w, x, y

['6993', '2633', '9795', 'p', 'b', '1267', 'e', 'g', '283', '7601', 'h', 'k', 'h', 'm', '1517', '8903', '543', '1141', 'h', 'y', 'b', 'd', 'n', '1143', '1179', '5699', 'z', 'q']

b, d, e, g, h, k, m, n, p, q, y, z