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.

['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']
f, k, m, x

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

['7379', 'j', '6531', 's', '8653', '223', 'h', '8835']

h, j, s