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: ['4985', '1859', '6247', '9053', '5889', 'b', 'f', 'b', 'p', 'm', '4761', '3075', 'f', '7591', '445', '2669', '1421', '4875', '8783', 'h', '9273', '7017', 'i', '8655', 'b', '7053', 'w', '431', 'q', 't', '1533', 'c', 'b', '8651', 'v', '3239', 'o', '5907', '6831', 'a', 'v']
Solution:
a, b, c, f, h, i, m, o, p, q, t, v, w