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.

Example Input: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']
Example Output: b, l, r, v, y

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

Example Input: ['j', '69', 'z', '6867', 's', 'h', '3561', 'x', 't', 'c', 'u', 'o', 'b', 'j', '9167', 'n', 'a', 'j', 'o', 'z', '3251', '4423', 'w', '5921', '8427', 'f', 'a', '5005', 'f', '6397', 'h', '1259', 'c', '3975', '31', 'i', 'h', '5617', '6315', 'm', 'm', 'n', '641', '1455']
Example Output:
a, b, c, f, h, i, j, m, n, o, s, t, u, w, x, z