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: ['2181', '7019', 'l', 'z', 'z', 'y', '1245', '4179', '6951', '7249', '2723']

Output: l, y, z


Input: Consider Input: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']

Output: b, v, y


Input: Consider Input: ['t', 'm', 't', '2099', '9411', '6093', '9467', 'h', 'h', '9889', 'z', '7733', 'l']


Output: h, l, m, t, z