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]: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
[A]: c, d, e, f, l, n, p, q, t, u, v, y


[Q]: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
[A]: e, f, g, h, k, q, u, z


[Q]: ['h', 't', 'y', '1623', '9803', '7987', 'b', '4723', 'u', '1859', 'q', '4667', 'q', '4911', '5233', 'r', 'v', 'l', 'k', '5379', 'f', 'y', 'x', '347', '3957', '5519', '9497']
[A]:
b, f, h, k, l, q, r, t, u, v, x, y