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', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']
[A]: d, i, j, m, s, t, v, z


[Q]: ['6463', '871', '5781', '283', '9653', 'f', '9661', '3365', '2889', '5499']
[A]: f


[Q]: ['4933', 'w', 'e', '5495', '4577', 'k', 'e', '9065', 'a', 's', '7789', 'g', 'l', 's', '3131', 'g', '3419', '5267', 'j']
[A]:
a, e, g, j, k, l, s, w