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]: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']
[EX A]: d, e

[EX Q]: ['i', '9575', '8995', 'm', 'o', '3015', '4005', '6909', '7195', '3361', 'j', '5253', '9523', '8879', '5861', 'e', 'y', 'e', '1525', 'i', '807', '8469', '3333', '4017', '2237', '3387', 'o', '643', 'p', '7129', '6243', 'y', '4913', 'z', 'f', '6909', 'f', '4347', '7227', 'o', 's', '9909', '8611']
[EX A]: e, f, i, j, m, o, p, s, y, z

[EX Q]: ['a', 'c', 'c', 'l', '9869', '4783', '8731', 'e', '6637', 'e', 'v', '8467', '1595', 'h', '2759', 'y', 's', 'c', '1499']
[EX A]:
a, c, e, h, l, s, v, y