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:
['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']
answer:
a, c, e, h, j, k, o, s, v, w, x, z


question:
['l', 'g', 'd', 'p', '8163', '6643', 'o', 'p', 'm']
answer:
d, g, l, m, o, p


question:
['i', '9577', 'w', 't', 'd', '8557', 'h', 'u', '3321', '8541', '6347']
answer:

d, h, i, t, u, w