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.
Q: ['s', '3293', '1005', '5635', 'e', '4427', '1445', 'c']
A: 
c, e, s