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]: ['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']
[EX A]: b, e, f, h, m, n, p, q, u, v, x, z

[EX Q]: ['a', 'a', 'b']
[EX A]: a, b

[EX Q]: ['p', '7067', '7145', '9579', 'e', 'n', '2483', 'o', 'w']
[EX A]:
e, n, o, p, w