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: ['5489', 'f', '6833', 's', 'c', '6575', 'w', '2957', '8465', 'v', 'h', '2119', '7731', 'e', '5367', 'e', '3357', 'p', '7565', 'n', 'x', 'n', 'f', '1075', '5941', '6505', 'j', 'p', '2853', 'l', 'q', '4727', 's']

A: c, e, f, h, j, l, n, p, q, s, v, w, x
****
Q: ['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']

A: d, e, h, i, m, n, v, z
****
Q: ['2539', '9775', 's', '9631', 'k', 'n', 'k', '2349', '3359', 'z', 'j', '8417', 'd', 'c', '2091', '4157', '5667', 'j', '5045', 'c', 'g', '6407', 'u', 'o', 'x', 'k', '6109', '1043', 'h', '4947', '6649', 'k', '6481', '2811', '9937', '289', 'n', 'a']

A:
a, c, d, g, h, j, k, n, o, s, u, x, z
****
