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: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']
Example Output: d, e, g, l, n, p, s, t, x

Example Input: ['4299', 'b', '4171', '7639', '6609', '927', '5249', 'o', 'p', '9851', 'e', '1311', '3777', '7799', '7687', '8809', 'c', 'r', '47', '1925', '1847', 'r', 'd', 'r', '1871', '5935', 'r', '2283', 'p', 'p', '2727', 'c', 'i', '7357', 'y', '5103', '6115', 'q', 'w', 'u', '9201', '4221', '7717', 'o']
Example Output: b, c, d, e, i, o, p, q, r, u, w, y

Example Input: ['i', '6181', 'w', '6749', '1305', 'n', '1999', 'h', 's', 'd', '9029', 'b', '7511', 't', '9989', '1645', 'c', 'r', '2721', 'q', 'k', 'y']
Example Output:
b, c, d, h, i, k, n, q, r, s, t, w, y