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: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']
Example Output: l, m, n, p, u, w, x, y

Example Input: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']
Example Output: e, f, l, n, p, q, r, s, w, y

Example Input: ['l', 'v', '1961', 'r', 'l', 'n', 'w', 'f', 'm', '9257', 'g', '9101', '627', 'n', 's', 'o', 'n']
Example Output:
f, g, l, m, n, o, r, s, v, w