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: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']

Output: e, h, l, m, n, o, t, y, z


Input: Consider Input: ['6769', '1057', '1021', 'n', '8231', '9173', '8123', 'a', '6053', 'q', 'y', '883', 'r', '1215', 'x', 'o', '9531']

Output: a, n, o, q, r, x, y


Input: Consider Input: ['5037', 'b', '6409', 'r', 'd', '3823', 't', '3587', 'v', '1587', '223', 'j', 'y', '145', 'q', '3307', '8851', '8943', '9149', 'n', 'y']


Output: b, d, j, n, q, r, t, v, y