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: ['57', 'j', 'n', '877', 'u', 'w', 'j', 'f', '8977', 'h', '469', '9417']

Output: f, h, j, n, u, w


Input: Consider Input: ['7417', '2597', '2633', '7721', 'v', 'l', 'p', '4389', 'l', '3965', '6279', 'm', 'v', 'o', 'd', 'o', 'h', 'd', 'r', 'e', '8993', '2711', 'o', 'q', '1399', 'i']

Output: d, e, h, i, l, m, o, p, q, r, v


Input: Consider Input: ['i', 't', '7599', 'r', '7717', '3691', '3799', '5491', 'd', '1751', '3831', 'd', 'e', 'u', '6245', 'h', '2483', 'u', '1525', '6665', '8297', 'l', 'k', '2917', 'f', 'l', '8211', 'i', '9723', 'w', 'a', 'w', 'y', 'a']


Output: a, d, e, f, h, i, k, l, r, t, u, w, y