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]: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']
[EX A]: a, c, e, g, h, i, k, p, q, r, u, v, w

[EX Q]: ['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']
[EX A]: a, b, c, d, e, j, k, l, n, o, p, r, y, z

[EX Q]: ['467', '8731', 'm', 'o', 'i', '9509', 'd', '601', 'k', '5081', '5651', '3709', 'a', '2023', '1121', 'g', 'z']
[EX A]:
a, d, g, i, k, m, o, z