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.

Q: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']

A: b, e, f, g, j, k, l, o, r, t, u, v, z
****
Q: ['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']

A: f, h, j, n, u, w
****
Q: ['5721', '1577', 'k', '4953', 'j', '1797', '8655', '663', 'r', 'm', '8565', '6785', 'b', 'v', 'w', 'v', '8763', '8071', 'w', 'y', 'j', '6593']

A:
b, j, k, m, r, v, w, y
****