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: ['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']

A: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y
****
Q: ['n', 'q', '6461', 's', '8565', '2237', '2071', '8143', '2977', '5511', 'j', 'o', '5793', 'j', 'm', 'n', '8031', 'j', '535', '5001', 's', 'y', '1737']

A: j, m, n, o, q, s, y
****
Q: ['b', 'h', 'v', '5899', 'n', '803', 'p', '6535', 'b', 'm', '8979', 'g', 'z', '7013', '8227', '3525', 'e', '2203', '3735', '8933']

A:
b, e, g, h, m, n, p, v, z
****