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]: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
[EX A]: a, b, d, e, g, h, o, r, u, v, w, y, z

[EX Q]: ['1945', 't', '4477', '4439', '6569', '2021', 'y', 't', '2725', '8947', '6921', '1373', '8107', 'g', 'c', 'w', 'x', 'b', '9117', 'k', '6567', '5073', '2307', 'e', 'b', '7405', 'e', 'x', '1419', 'd', 'o', 'n', 'a', '2647', 'z', '1459', 'n', '6137', 'u', 'b', 'q', '4459']
[EX A]: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z

[EX Q]: ['b', 'z', 'n', '5537', '6423', '219', '681', 'l', 'x', '9837', '2493', 'j', '7161', '4069', '635', 'p', '4239', '2447', 'j', 'e', '1121', 's', 'y', 'm', 'b', '7837', 'r']
[EX A]:
b, e, j, l, m, n, p, r, s, x, y, z