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: ['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']

A: c, e, h, k, p, q, u, v, y
****
Q: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']

A: b, c, e, g, h, o, p, q, v, x, y, z
****
Q: ['4743', '59', '7717', 'r', 'v', 'x', 'a', '897', '8089', 'k', 'm', 'x', '7597', '7635', '3679', '1305', 'b', 'd', '6237', 'y', 'f', '3829', 'o', 'u', 'u', 'q', 'u', 'c', '1325', 'd', '219', '307', 'o', '5179', 'r', 'f', 'c', 'f', 'i', 's', 't', 'y', 'b', 'm']

A:
a, b, c, d, f, i, k, m, o, q, r, s, t, u, v, x, y
****