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]: ['v', '6635', '5395', '3263', '4391', 'h', '1521', 'f', '9861', '6125', '1673', '3679', '8681', '4967', 'f', 'a', 'c', 'k', 'n', '4155', 'e', 'm', 'i', '1699', 'r', 'f', 'u', 'r', '3451', 'v', '7239', 'o', '4359', 'l', 'a', '2925']
[EX A]: a, c, e, f, h, i, k, l, m, n, o, r, u, v

[EX Q]: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
[EX A]: d, e, h, i, l, m, o, p, q, r, v

[EX Q]: ['1463', 'z', 'n', '8197', '4879', 'u', 'd', '6633', '3225', '2587', 'f', '8077', 'j', '6439', 'k', 'n', '9537', '4677', '6779', 'q', '567', 'd', 'f', '6593', 'v', '7581', '3509', 't', 'm', '693', '3301', 'a', '55', '1109', 'm', '6609', 't', '6093', 'l', '9419', '6917']
[EX A]:
a, d, f, j, k, l, m, n, q, t, u, v, z