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.

Input: Consider Input: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']

Output: c, f, g, k, n, p, q, r, u, w


Input: Consider Input: ['u', '1343', 'd', 'c', '9567', 'e', 'd', 'y', 's', '4199', '3217', '2937', '9345', 'd', 'l', '9875', '5987', 'p', '2585', '5843', '9643', '2423', 'e', 'l', 's', '3503', 'b', 'w', '9685', 'p', '6055', 'k', 'e', 'e', 't', '865', '6071', 'j', '3439', 't']

Output: b, c, d, e, j, k, l, p, s, t, u, w, y


Input: Consider Input: ['773', '2067', 'l', 'b', '947', '3927', '3639', '6165', 't', 'y', '4341', '9989', 't', 'd', 'o', 'j', 'n', '4449', '1919', '9967', 'r', 'i', 't']


Output: b, d, i, j, l, n, o, r, t, y