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.

['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
c, i, m, v

['h', 'l', 'i', '1507', 'h', '409', '6777', 'u', '5563', '6113', '6513', '9949', '461', 'z', 'm', '2519', 'r', '4699', 'n', 'x', '4645']
h, i, l, m, n, r, u, x, z

['6077', '6507', '7279', 'u', '7875', '1321', 'w', 'y', '9029', 's', 'u', 'm', 'p', '2697', 'f', 'j', '5525', 'c', '2901', '8117', 'n', 'y', '8859', '7063', '9413', 'i', 'n', '4171']

c, f, i, j, m, n, p, s, u, w, y