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.

['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']
b, d, e, g, h, i, j, w, y

['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

['1705', 'n', 'n', 'j', 'a', '395', 'm', '8601', 'l', '7897', '1049', '709', '9545', 'v', 'b', '2293', '2183', '3227', '8687', '3829', 'z']

a, b, j, l, m, n, v, z