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.
One example: ['8129', 'a', '4245', 'y', 'm', 'a']
Solution is here: a, m, y
Explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Now, solve this: ['6225', 'm', '1793', 'x', 'x', '1981', '4953', 'j', 'c', '105', 'h', '7973', '4873', '9857', '781', 'e', '6095', '3695', 't', 'x', '6725', 'v', '6467', '901', '6773', '2947', '95', 'z', '9487', 'h', 'k', '4601', 'x', '6407', '3583', '5687', 'j', '1765']
Solution:
c, e, h, j, k, m, t, v, x, z