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.
--------
Question: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']

Answer: e, h, l, m, n, o, t, y, z


Question: ['k', 'z', '303', 'a', 'f', 'q', 'i', '1475', '3453', 'd', 'w', '4037', 'z', 'h', 'k', '3547', '1561']

Answer: a, d, f, h, i, k, q, w, z


Question: ['3013', 'k', 'w', '5935', 'p', 'o', '2351', '5183', 'e', '6219', '4405', '2021', '5559', '7269', 'k']

Answer:
e, k, o, p, w