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: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']

A: a, c, e, g, j, l, n, q, s, x
****
Q: ['s', 'w', 'c', '4137', 't', '2437', '349', 'h', '4539', 't', 'b', 'y', 'q', 't', '9087', 'c', '9489', '6285', '6247', '8353', 'n', 't', '8661', 'p', 'z', 'p', '773', 'w', 'q', '8081', 'r', 'u', 'z', 'k', 'a', 'b', '7513', '5549', '5325', '1101', 's', '6507', '3317']

A: a, b, c, h, k, n, p, q, r, s, t, u, w, y, z
****
Q: ['f', 'p', 'c', 'q', '9697', '1129', 's', 'a', 'x', 'v', '9783', 'u', 'x', '5123', '6365', '8413', '3385', '6923', '5705', 'n', '9253', 'r', '5707', 'y', 'r', '1999', 'a', 'g', 't', 'a', 'i', 'f', '8997', '4477', 'z', 'r', 'g', '5845', '3363', 'y', 'w', 'g', 'n', '2541']

A:
a, c, f, g, i, n, p, q, r, s, t, u, v, w, x, y, z
****