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.

Example Input: ['8381', 'j', '761', '5431', '7601', 'd', '4339', '1479', 'b', 'x', 'f', 'w', '2437', '7725', '6385', '411', 'w', 'w', 'i', '2769', '5709', '5703', 'k', '5301', '6503', '7833', 'y', '3813', '7061', '5531', 'n', '2251', 'y', '8941', '8481', 's', 't', 't', '3345', 'k', '1545']
Example Output: b, d, f, i, j, k, n, s, t, w, x, y

Example Input: ['6463', '871', '5781', '283', '9653', 'f', '9661', '3365', '2889', '5499']
Example Output: f

Example Input: ['1039', '4819', 'u', '4399', 'x', '1023', 'b', 'b', '3525', 'd', 'x', '5833', 'n', 'e', '5161', '1465', '3841', 'x', '9055', 'x', '7267', 'x', '2617']
Example Output:
b, d, e, n, u, x