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]: ['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']
[EX A]: a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z

[EX Q]: ['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']
[EX A]: b, d, f, j, k, n, o, q, r, u, z

[EX Q]: ['g', 'l', '4501', '9115', '5029', '6093', '8695', '481', 'p', 'p', 'n', '3673', '8255', 'b', '1553', 'm', 'v', 'k', '3367', 'u', 's', '8319']
[EX A]:
b, g, k, l, m, n, p, s, u, v

