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]: ['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]: ['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']
[EX A]: a, b, d, e, j, k, m, n, o, p, q, u, v, w, x

[EX Q]: ['z', '4711', 'd', '8513', 'l', '897', 'x', '6093', '819', '3233', '5597', 'x', '4997', 'f', 'q', 'o', '8707', 'h', '1511', '7949', '6397', 'e']
[EX A]:
d, e, f, h, l, o, q, x, z