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.

[EX Q]: ['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']
[EX A]: c, f, h, p, s

[EX Q]: ['a', 'p', 'y', 'l', 'l']
[EX A]: a, l, p, y

[EX Q]: ['8701', 'e', '1047']
[EX A]:
e