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.

['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
a, d, f, h, i, j, o, r, u, v, w, y, z

['a', '533', '67', 'z', 'z', '9283', 'o', 'a', '7045', '1521', 'm', 'h', 'q', '4173', '7497', '319', '5721', '6097', 'i', '9829', '1801', '7347', 'r', 'z', '239', '4279', 'e', 'k', 'r', 'v', '6653', '599', '8597', 'd', 'r']
a, d, e, h, i, k, m, o, q, r, v, z

['w', '5123', '7255', 'c', 'j', 'c', '9313', 'c', '7185', '2187', 'a', 'b', 'o', 's', 'a', '755', '8613', '4553', '215', 'd', 'w', 'g', 's', '9731', 'v', 'h', '7553', '119', '1345', 'a', '8289', 'e', '3313', 'r', '2359', '1779']

a, b, c, d, e, g, h, j, o, r, s, v, w