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: ['9117', '1153', 'f', 'b', '9979']

Output: b, f


Input: Consider Input: ['621', '4803', '9631', 'v', '7733', 'e', 'j', 'x', 's', '7347', 'b', 'q', '4431', 'k', '1537', 'k', 'u', '6223', 'w', '2701', 'q', 'm', 'j', 'd']


Output: b, d, e, j, k, m, q, s, u, v, w, x