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.

['2883', 'a', 'f', 'z', '233', 'n', '289', '2987', '5565', 'c', '7095', 'y', 'a', '6451', 'c', '993', '7599', '9907', 'q', 'y', '5073', '8125', 't', '2219']
a, c, f, n, q, t, y, z