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: ['9113', '3625', 'u', '8189', '3649', '259', '5539', '1583', 'g', '4037', 'y', 'v', '8337', 'd', 'q', 'j', 'c', 'h', 'p', '1601', 'z', 'c', 'n', '1767', '1679', '1805', 'm', '4469', '2487', '6015', '973']

A: c, d, g, h, j, m, n, p, q, u, v, y, z
****
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: ['915', 'f', '8999', 'j', '8807', 'n', '4265', '3167', 'r', 'a', '5697', '7623', 'r', 'a', 'm', '9863', '2161', '3521', '2893', 'c', 's', 'g', 't', '7751', 'd', 'v', 'b', 'z', 'v', 'n', 'p', '9023', '1717', 'g', '1543', 'r', '3709', 'n', 'h', '4697', '7193', 'o']

A:
a, b, c, d, f, g, h, j, m, n, o, p, r, s, t, v, z
****