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

Output: b, v, y

Input: Consider Input: ['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']

Output: b, c, e, f, h, l, o, t, x, y, z

Input: Consider Input: ['h', '4649', '8871', '6157', 'y', 'z', '9633', 'i', '3105', '4693', '9201', '8403', '7177', 'd', 'e', 'a', '2969', 'j', 'e', 'c', 'e', 'a', 'y', 'i', 'f', 'p', 'c', 'y', 'p', 'j', 'f', '8489', 'z']
Output: a, c, d, e, f, h, i, j, p, y, z