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]: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']
[EX A]: d, e, h, i, l, m, o, p, q, r, v

[EX Q]: ['e', 'z', '5199', 'x']
[EX A]: e, x, z

[EX Q]: ['i', 'n', '3157', '9959', '8261', '3021', '1053', 'v', 'b', 'x', '4671', 'q', '2737', 'f', '8371', 's', 'w', '4599', '7273', 'w', 'j', '5577', 'g', 'c', '9731', 'o', '7215', 'k', 'f', 'k', '8505', 'z', 'g', '6091', 'h', 'u', '8359']
[EX A]:
b, c, f, g, h, i, j, k, n, o, q, s, u, v, w, x, z