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.

Q: ['o', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']

A: c, e, f, m, o
****
Q: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']

A: b, h, n, u
****
Q: ['5385', '4785', 'f', 'n', '683', 'o', 'e', 'p', 'y', 'l', '8485', '3817', 'g', 'd', '1107', 's', 'v', '5323', '8915', 't', '9519', 'r', '8089', 'r', '7849', '1005', 'o', '1037', 'q', '3525']

A:
d, e, f, g, l, n, o, p, q, r, s, t, v, y
****