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', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']
[A]: c, h, j, k, m, p, r, t, w, x, y, z


[Q]: ['3127', '9253', '5667', '9453']
[A]: -1


[Q]: ['c', '9881', '4943', 'l', 'h', 'x', 'n', '4887', '3443', 'u', 'h', 'z', 'i', '4801', 'x', 'c', '5555', 'r']
[A]:
c, h, i, l, n, r, u, x, z