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: ['5337', '4877', '9443', '3445', 'u', '2571', 't', 'n', 'x', '1985', '5145', '3397', 'p', '9259', 's', 'x', 'u', 'c', 'g', 't', 'j', '829', '8273', 'e', 'j', 'r', 'x', '865', '4773', 'h', '4407', '8591']
Example Output: c, e, g, h, j, n, p, r, s, t, u, x

Example Input: ['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']
Example Output: b, e, f, i, k, l, m, o, p, q, r, t, v, w, y

Example Input: ['4049', 'b', 'p', 'p', '8125', '6299', '513', 'c', '4785', 'j', 'g', '4743', 'u', 'q', 'u', 'b', '579', 't', 'y', '3355', '5771', 'z', 'j', 'i', '9973', 'e', '6491', 't', 't', '8999']
Example Output:
b, c, e, g, i, j, p, q, t, u, y, z