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.

[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']
[A]: a, b, e, f, g, h, i, j, k, n, p, r, u, y


[Q]: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']
[A]: i, j, o, w


[Q]: ['w', 'b', 'w', '5989', '3399', 'k', '8443', 'v', '4779', '7007', 'p', '3431', 'e', '1619', 'w', '1965', '101', '5989', '313', '1639', '9837', 's', '5945', 'm', '5021', '3599', '1165', 'x', '9533', 'k', '1903', '1555']
[A]:
b, e, k, m, p, s, v, w, x