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: ['4371', '9499', 'e', 'w', '9969', '8367', '2897', '1745', 'i', '7049', '9773', 'h', '9649', 'u', '4673', '8513', '8547', 'z', '1995', '7739', '2215', '171', 'c', '7527', '2479', 't', '5223', 'p', '2313', '3243', '2281', 'r', 'c']
Example Output: c, e, h, i, p, r, t, u, w, z

Example Input: ['1367', 'h', '4153', '1587', 'h', 'b', 'n', 'u', 'n']
Example Output: b, h, n, u

Example Input: ['4675', '5469', '8807', 'b', 'p', 'h', 'x', 'f', '3357', 's', '9787', 'p', 'i', '9179', 'o', 'k', '2517', 'f', 'z', '6611', '683', '1781', 'y', '7243', '9967', '3569', '6665', 'w']
Example Output:
b, f, h, i, k, o, p, s, w, x, y, z