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: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']

Output: c, j, q, v


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

Output: e, x, z


Input: Consider Input: ['9941', 'p', 'v', 'c']


Output: c, p, v