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.

['5957', 'd', 'i', 'b', 'e', '5565', 'c', 'i', '2919']
b, c, d, e, i

['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
a, b, g, l, r, s, t, w, y

['9593', 'j', '1881', '363', 'f', 'h', 'x', 'q', 'l']

f, h, j, l, q, x