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: ['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']

Output: c, i, m, n, p, z


Input: Consider Input: ['5193', 'h', 'm', '703']

Output: h, m


Input: Consider Input: ['n', '2067', 'l']


Output: l, n