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: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']
Example Output: b, l, r, v, y

Example Input: ['w', 'r', '6891', '519', '2279', '5671', '9049', '6189', 'r', 'h', 'd', 'n', 'w', 'b', '5439', 'm', '255', 'y', 'k', 's', '617', 'v', '5547', 'h', '5233', '1119', '4339', '677', 'd', 'o', '7679', '7995']
Example Output:
b, d, h, k, m, n, o, r, s, v, w, y