instruction:
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:
['n', 't', '2901', '9697', 'a', 'j', 'x', 'a', '4437', '2255', '2177', 's', '3173', 'j', 't', '5713', '4091', '4253', '5553', 'i', '4533', 'i', 'e', '6899', 's', '3541', '2139', '2705', 'm', 'u']
answer:
a, e, i, j, m, n, s, t, u, x


question:
['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']
answer:
c, f, h, p, s


question:
['301', 'z', 'i', '5573']
answer:

i, z