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: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']

Output: a, c, h, i, j, k, r, s, u


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: ['q', 'd', '6567', 'g', 'y', '5767', '2471', 'r', 's', '2679', '1141', 'q', 'g', 'l', 'r', '8633', 'f', '5343', '2921', '5669', 'c', 'w', '499', '5713', 'b', '4757', '2525', '7351', 'd', 'x', 'o', 'a']


Output: a, b, c, d, f, g, l, o, q, r, s, w, x, y