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: ['s', 'w', '8949', '4025']

Answer: s, w


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: ['l', '2111', '5289', '5233', '7323', 'f', '2181', '8591', 'e', 'h', 'f', '7157', '2583', '1741', '4809', 'f', '1355', 'v', '2143', 'a', 'b', '7197', '683', 'w', 'h', '5295', 'l', 'b', '4567', '1619', '669', 'n', '1817', '7311', 'w']

Answer:
a, b, e, f, h, l, n, v, w