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: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
Example Output: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

Example Input: ['q', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']
Example Output: a, c, e, g, h, i, l, m, p, q, t, v, w, x, y

Example Input: ['8901', '9237', 'i', 'o', 'b', '8413', '8801', '9139', 'l', 'j', '4955', 'p', '753', '2687', '1893', '9917', '3945', '8029', '7317', 'i', '857', 'e', 'p', '1211', '2885', '1503']
Example Output:
b, e, i, j, l, o, p