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]: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
[EX A]: a, b, c, j, l, r, t, v, x

[EX Q]: ['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']
[EX A]: a, c, e, h, j, k, o, s, v, w, x, z

[EX Q]: ['p', 'y', '8905', 'x', 'b', '5959', '43', 'c', '8775', '2611', '1899', '3121', 'j', 'c', 'u']
[EX A]:
b, c, j, p, u, x, y