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]: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']
[A]: d, e, g, h, i, m, t, u, v, x, y


[Q]: ['z', 'l', '1759', 'k', '8197', 'v', '931', '2587', '7219', '3455', 'e', '8135', 'm', 'n', 'm']
[A]: e, k, l, m, n, v, z


[Q]: ['g', 'k', '4129', 'k', '5977', 't', 'g', '6411', '5345', '4357', 'g', '7531', 'c', 't', 'p', 'b', 't', '7237', '3787', 'v', '5777', 'p', 'c', 'x', 'w', '7805', 'f', 'y', '7433']
[A]:
b, c, f, g, k, p, t, v, w, x, y