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: ['l', 'g', 'd', 'p', '8163', '6643', 'o', 'p', 'm']
Example Output: d, g, l, m, o, p

Example Input: ['3947', '4809', 'b', 'a', '4769', '4179', '535', '5965', 'f', 'j', '2265', 'w', '3103', 'u']
Example Output: a, b, f, j, u, w

Example Input: ['n', '7115', 'd', '7875', 'u', '9313', '699', 'i', '4991', 'x', 'i', '7089', '4617', '689', 't', '4845', '7327', 'k', '5727', '4175', 'q', '4093', 'e', 'a', '7465', 'o', '335', '9485', 'p', 'c', 'g', '7343', '5485', '409', '161']
Example Output:
a, c, d, e, g, i, k, n, o, p, q, t, u, x