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.

[EX Q]: ['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
[EX A]: e, f, i, j, r, s, u, v, w

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

[EX Q]: ['3333', 'f', '9257', 'x', '2655', 'b', '7225', '7633', '8197', 'j', '5049', 'v', 't', '7789', '2361', '6457']
[EX A]:
b, f, j, t, v, x