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: ['7777', '6223', 'k', 'k', 'd', '9743', '189', '7705', 'c', '6115', '4275']
Example Output: c, d, k

Example Input: ['9689', '9727', 't', 'd', '2103', 'c', 'n', '8553', '4559', '7815', 'u', 'l', 'c', 'e', 'u', 'n', '7207', '4875', '7699', 'h']
Example Output: c, d, e, h, l, n, t, u

Example Input: ['9521', '3973', 'y', '5117', '697', 't', '7179', '6451', 'c', 'y', '2329', '2819', '8959', '8675', 'z', '4007', 'f', '8127', '8577', 'o', '3347', '7049', '655', '1263', 'z', 'f', 'z', '7019']
Example Output:
c, f, o, t, y, z