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]: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
[A]: c, d, k


[Q]: ['z', 'l', 's', 'f', 'j', 'x', '1125', 'd', '37', '5009', '9187', 'b', '8683', '8841', 'y', '9955', '1571', 'm', '347', '3679', '5797', '2133', 'g', 'u', '9817', '6347', '2067', '1927', '167', '4215', '45', 't', 'd', '6599', '4751', 'g', 'l', 'u', '7881', 's']
[A]: b, d, f, g, j, l, m, s, t, u, x, y, z


[Q]: ['y', '4811', 'b', 's', '837', '6407', 'o', 'd', 'p', 'u', '5541', 'p', 't', '6659', '4479', '5629', 'k', '7781', '4963', '8933', '1949', '6863', 'n', '6319', '5437', '6221', 'v', '2277', '1837', 't', '6943', 'a', '6619', '2687', 'u', '949', 'r', '9501']
[A]:
a, b, d, k, n, o, p, r, s, t, u, v, y