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', 'm', '8015', '787', '4787', '1727', 'f', 'e', 'c']

Output: c, e, f, m, o


Input: Consider Input: ['e', 'z', '5199', 'x']

Output: e, x, z


Input: Consider Input: ['4451', 'e', 'v', '9353', '2737', '3811', '3971', '3121', '5025', '1809', 'j', 'j', '1387', 'n', '1267', 'k', 'l', 'r', '5733', '9193', '123']


Output: e, j, k, l, n, r, v