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: ['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']
Example Output: b, e, f, h, m, n, p, q, u, v, x, z

Example Input: ['w', '8777', 'y', 'e', '8015', 't', 'w', '53', '9149', 'e', 'k', '1837', 'b', 's', '4007', '4905']
Example Output: b, e, k, s, t, w, y

Example Input: ['i', '325', '6699', 'a', 'q', 'v', 'd', 'e', 'e', '5595', 'e', 'n', 'h', '7307', 'v', '9787', 'c', '7591', 's', 'd', 'w', '7089', 'f', '5995', 'm', 't', 'w', '5397', 'p', 'c', 'c', '2933', 'e']
Example Output:
a, c, d, e, f, h, i, m, n, p, q, s, t, v, w