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: ['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']
Example Output: a, c, d, f, g, j, k, m, p, t, w, x

Example Input: ['3733', '2357', 'k', 'w', 'u', '155', 'q', 'e', '9449', '553', '7485', 'a', '8089', '9795', 'w', 's', '6021', '2169', '6719', '3493']
Example Output:
a, e, k, q, s, u, w