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.

['2705', 'n', 'r', '8259', '6839', '3239', 'w', 'z', '2611', '2957', '2303', '6315', '7801', 'c', 'w', 'm', '5049', '6465', '599', 'h', 'q', '7559', 'n', '9917', 'v', 'l', '643', '6415', '3587', 'c', '917', '4435', 'p', 'a', '317']
a, c, h, l, m, n, p, q, r, v, w, z

['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']
a, c, f, g, h, m, n, s, w, y

['w', 'f', 'x', '1179', '1939', 'r', 'd', '8013', '3727', 'u', '6595', '6943', 'g', '6011', '6993', 'z', 'i', 'j', 'z', 'k', 'z', 'x', '4989', 'v', 'x', '2159']

d, f, g, i, j, k, r, u, v, w, x, z