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: ['8129', 'a', '4245', 'y', 'm', 'a']
Example solution: a, m, y
Example explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Problem: ['j', '2295', '3635', 'd', '9721', '1481', 'w', '3561', 's', '111', '6121', 'g', '6005', '7669', '101', 'q', '5185', '6079', '525', '3947', '3277', '357', '3757', '5599', 't', '2095', 'm', 'n', '6905']
Solution: d, g, j, m, n, q, s, t, w