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.

['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
c, h, l, u, x

['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

['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']

b, e, n, t, y