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: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']

A: j, l, n, q, r, s, y
****
Q: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']

A: c, f, g, k, n, p, q, r, u, w
****
Q: ['9871', 'w', 'h', '9147', 'k', '8463', '4701', '5441', '4869', '9661', '2589', 's', 'y', '8921', 'q', 'w', 'i', '4807', '3465']

A:
h, i, k, q, s, w, y
****