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

['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
c, i, m, n, p, z

['h', '665', '5253', 'l', 's', 's', 'n', 'y', '4041', 'v', 'f', '4281']

f, h, l, n, s, v, y