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.

['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']
d, f, i, l

['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']
f, l, r, w, x, z

['9547', 'p', 'r', 'f', '5433', '969', 'e', '157', 'y', '557', 'c', '2815', 't', '9293', '4753', 'i', '4357', '8185', 'l', '933', 'r', '9003', 'a', '2837', 'w', 'o', 'x', '1423', '3839', 'n', 'r', '8253']

a, c, e, f, i, l, n, o, p, r, t, w, x, y