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: ['2995', 'a', '6163', '6093', '4489', 'u', 'd', '8863', '5249', '5637', '7121', 'i', 'g', '6569', '9659', '3985', 'j', 'q', '8347', 'q', '5293', '2529', 'y', '741', 't', '3889', '385', 'j', 'b', '201', 'q', '7723', '5845', '3343', '8401', 'p', 'f']
Solution: a, b, d, f, g, i, j, p, q, t, u, y