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]: ['s', 'c', 'e', '2457', '9413', 'r', '9949', 's', 'z', 'e', 'a', 'o', '7207']
[EX A]: a, c, e, o, r, s, z

[EX Q]: ['1197', '305', 's', '1113', 'n', '2207', 'e', '227', '2833', '607', '3049', 'v', '4615', 'a', 'k', 'r', 's', '3571', 'f', '4215', 'f', '8985', '5559', '4111', 'u', '1433', '1943', '8831', 'w', 'x', 'o', '9023', 'u', 'y', 'p', 's', 'h', '8877', 'p', 'n', '8903', '5811']
[EX A]: a, e, f, h, k, n, o, p, r, s, u, v, w, x, y

[EX Q]: ['9199', 'm', 'c', 'u', 'm', 'q', '6741', 'a', '1111', '8207', '9435', 'k']
[EX A]:
a, c, k, m, q, u