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]: ['y', 'u', 'c', '5909', 'x', '9865', 'e', 'h', '5125', '4719', 'w', '8855', 'i', 'd']
[EX A]: c, d, e, h, i, u, w, x, y

[EX Q]: ['5499', 'm', '327', 'h', '5765', '4231', 'y', 'g', 's', '883', '9843', '2751', '8967', 'z', '2301', 'l', 'l', 'k', '7843', '7221', '3643', 'k', '5951', 'r', '9441', '235', '3835', 'l', 'e', 'y', '4061', 'l', '1177']
[EX A]: e, g, h, k, l, m, r, s, y, z

[EX Q]: ['4405', '4141', '3691', '4781', '989', '1741', 'o', 'x', 'w', 'e', 'b', '2033', '2187', '6781', '5621', 'f', 'l', '5887', '77', '8893', 'n', 'e', '7885', '4287', '3935', '3243', 'l', 'q', 'j', 'm', 'b', 'x']
[EX A]:
b, e, f, j, l, m, n, o, q, w, x