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.

['1499', '9631', 'z', 'k', '1367', '7955', 'p', '9441', '725', 'i', '1113', '1515', 'v', 'g', '6359', 'a', 'v', '6473', 'o', 'o', 'b', '781', 'j', 'a', '2069', '3343', '7153', '9281', '4523', 'w', 'z', '7449', 'g', '807', '6591', '4023', 'k', 'q', '449', '2215', '6227', 'l', '7459']
a, b, g, i, j, k, l, o, p, q, v, w, z