Definition: 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: ['4351', 'x', 'k', 'e', '4143', '6621', 'v', '1709', 'v', 'y', 'q', '7461', 'o', 'w', 'o', '3949', 'd', '2507', 'a', 'v', 'h', 's', '333', 'o', 'v', '4471', '5149', 'v', '2191']
Output:
a, d, e, h, k, o, q, s, v, w, x, y