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.

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

Example Input: ['h', '6865', '4019', '8571', 'y', '5575', '7835', '9537', 'n', '875', 't', 'a', 's', '2769', 'p', '1607', 'n', '4087', '961', '7869', '5085', '2131', '4867', 'j', 'h', 'y', '3105', '6609', 's', 'l', '3399', '5013']
Example Output: a, h, j, l, n, p, s, t, y

Example Input: ['3275', '171', '3931', 'j', '2463', 'm', 'p', 'r', '2635', '8627', 'x', 'p', 'l', '5973', 'g', '1145', '3443', 't', '4445', '1495', '5127', 'k', '3599', 'w', 'j', '6803', '6653', 'k', '5421', 'v', '4095']
Example Output:
g, j, k, l, m, p, r, t, v, w, x