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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']

Output: c, d, i, j, k, n, u, v, z


Input: Consider Input: ['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']

Output: b, d, e, f, n, o, p, q, r, v, w, z


Input: Consider Input: ['b', '9335', 'y', 'm', '2967', '6669', 'v', 'k', '2713', 'a', 's', '3159', '6309', '1673', '8779', 'o', 'p', 'q', '4833', '2415', 'r', 'b', 'h', '413', 'z', 'w', 's', '9599', 'r', '3859', '9193', '4073', '4197', 'x', '6023', '7467', 'e']


Output: a, b, e, h, k, m, o, p, q, r, s, v, w, x, y, z