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]: ['o', 'c', '6469', 'x', '8815', '4441', '6193', 'u', 'm', 'a', '9879', 'p', '8335', 'c', 'z']
[EX A]: a, c, m, o, p, u, x, z

[EX Q]: ['j', 'p', '8333', '8079', '4703', '7089', '8859', 'b', 'y', 'g', '7971', '6999', '2011', 'k', 'e', '9609', '4179', '3993', 'u', '3957', '6313', '4229', 'k', '5963', 'e', 'y', 'r', 'e', 'a', '2213', 'e', 'i', 'f', '7979', 'r', 'a', 'h', 'e', 'n']
[EX A]: a, b, e, f, g, h, i, j, k, n, p, r, u, y

[EX Q]: ['o', '6683', '3457', '1789', 'g', 'z', 'y', 'u', 'm', '3193', 's', 'u', '3063', '9297', 'v', '9149', '183', 'f', 'u', 'y', 'z']
[EX A]:
f, g, m, o, s, u, v, y, z