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: ['7677', '4069', 'b', 'w', '4381', 'b', '5757', '711', '765', '8347', '6547', '9527', '945', '5333']

Output: b, w


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: ['l', 'h', 'd', 'e', 'u', '2067', 'c', '2921', 't', 'v', '4641', '2729', '6787', 't', 'd', 'a', 'v', '9499', '5681', '8203', 'b', '9819', '5531', 'f', '3125', 'q', '9877', 't']


Output: a, b, c, d, e, f, h, l, q, t, u, v