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]: ['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']
[A]: a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z


[Q]: ['7073', 'd', 'e']
[A]: d, e


[Q]: ['777', 'c', '1829', '7001', '5899', 't', 'l', 'h', 'r', '2961', '403', 'p', 'q', 'u', 'w', 'd', '3769', 'b', 'e', '1111', '3197', 'x', 'd', 'q', 'k', 'x', '5503', 'o', 'g', '2373', '9019', '4235', 'r', '8905', 'd', '1093', '6437', '4761', '4257', 'x', 'k', 'v', 'd', '2869']
[A]:
b, c, d, e, g, h, k, l, o, p, q, r, t, u, v, w, x