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: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']

A: d, e, f, j, k, r, u, v, w, x, z
****
Q: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']

A: a, b, g, l, r, s, t, w, y
****
Q: ['4305', '8849', '4407', 'q', 't', 'q', '939', '7249', '7119', 's', '5927', '2569', '6373', '8687', '1757', '3209', 'f', 'j', '2903', '8295', '7983', '6219', 'h', 's', 'p', '1317', '5819', '5515', 't', '2507', '7011', '5391', 'o', '631', 'c']

A:
c, f, h, j, o, p, q, s, t
****