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: ['6597', '7889', 'x', 'v', 'm', 'j', 'j', 'w', 'v', '177', 'x', '8353', '5897']
Example Output: j, m, v, w, x

Example Input: ['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']
Example Output: f, i, j, m, q, r, t, y

Example Input: ['2061', '3465', '1441', '1573', '7991', '8483', 'f', '4425', '6441', '3845', '9965', '2233', 'q', '5041', '3831', '1905', '3623', '5007', '6583', 'y', '8413', 'g', 'f', '3145', 'w', '1247', '3981', 'o', 'k', '3019']
Example Output:
f, g, k, o, q, w, y