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]: ['m', '6443', 'd', 'o', 'p', 'q', '3765', 'k', 'm', 'y', 'j', '3531', 'y', 't', '671', 'j', '3699', 'a', 'i', '1843', 't', 'd', '1205', 'k', 'h', '1209', '2913', '1301', 'k', 'd', '1769', '7985', 's', 'p', 'f', '4583']
[A]: a, d, f, h, i, j, k, m, o, p, q, s, t, y


[Q]: ['2799', '7519', '345', 'e', 'l', '9369', '4703', '4111']
[A]: e, l


[Q]: ['9473', 'z', '4835', 'j', 'e', 'b', '6031', '5553']
[A]:
b, e, j, z