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.

['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
e, h, l, m, n, o, t, y, z

['x', 'i', 'r', '6011', 't', 'f', 'b', 'i', '8367', '4051', '1459', 'f', '5583', '9609', 'l', 'q', 'g', '8443', 'o', '8697', '7053', '8325', 'k', '7021', 'q', 'm', '6899', '9981', '8985', 'i', 'j', '8043', 'k', '535', '7603', '7629', 'k', '2779', 'g', '2049', 'x', 'd', '8527', 'k', 'q']
b, d, f, g, i, j, k, l, m, o, q, r, t, x

['j', 'a', '3933', 'n', '2575', 'r', 'g', 'p', 't', 'q', 'z', 'k', 'x', '5199', '6141', 'u', 'p', '5151', 'n', '4901', 'f', 'j', 't', '1003', '5199', '3771']

a, f, g, j, k, n, p, q, r, t, u, x, z