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.

[EX 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']
[EX A]: b, d, f, g, j, l, m, s, t, u, x, y, z

[EX Q]: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']
[EX A]: a, c, d, e, f, k, l, m, n, q, t, w, z

[EX Q]: ['k', '287', 'o', 'g', 'e', 'f', '4039', '1551', 'i', '4111', 'f', 'f', '9767', 'i', '139', '717', '7531', '8779', 'k', '6311', '2777', 'y', 'n', '4475', 'f']
[EX A]:
e, f, g, i, k, n, o, y