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.
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Question: ['5193', 'h', 'm', '703']

Answer: h, m


Question: ['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']

Answer: d, e, h, i, m, n, v, z


Question: ['8013', 'z', 'p', '123', 'o', 'm', '8375', '6631', '9051', 'w', '1679', 't', 'h', 'i', '5157', '2729', '6519', '5813', '433', '4063', '2919', 'q', 'p', '2079', 'l', 'z', 'x', '97', '3447', '6945', 'i', 'e', '465', 'a', 'y', '4771', '3701', '8085', 'w', '3997', '5659', 'r', '4011']

Answer:
a, e, h, i, l, m, o, p, q, r, t, w, x, y, z