Q: 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.
['1635', 'q', '5245', '1325', '5775', '967', '8073', 'o', '4257', 'o', '1211', 'j', 'y', 'o', 'i', '5311', 'l', 'w', '7189', '4577', '1277']
A:
i, j, l, o, q, w, y