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]: ['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']
[A]: a, c, e, f, h, i, k, l, m, n, o, r, u, v


[Q]: ['s', 'w', '8949', '4025']
[A]: s, w


[Q]: ['7433', '1763', '8965', 'a', '1337', 'o', '7051', '1715', '2419', '4929', 'i', 'o', '9539', '5601', 'n', 'l', 'x', '8539', '5003']
[A]:
a, i, l, n, o, x