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: ['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: ['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']

A: a, l, m, p, v, w, y
****
Q: ['w', 'h', '4745', 'v', '4675', '3587', '5389', 'l', 'i', 'k', '8189', '7511', '9323', 'w', 'v', 'v']

A:
h, i, k, l, v, w
****