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.

['d', '4377', '9271', '8053', '9519']
d

['6249', '1235']
-1

['v', '2687', 'm', 'r', 'e', '4027', '2415', '2301']

e, m, r, v

