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:
['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']
answer:
h, i, m, n, r


question:
['n', 'h', 'h', 'e', 'p', '1265', '4853', '9433', '1227', '1619', '6381', 'o', '8285', 'k', 'u', '7471', 'm', '6887', '6579', '5813', '5563', '8535', 'n', '3743', 'h', 't', '4497', '2791', 'e', 'v', '6769', '7969', 'x', 't', 'x', 'q']
answer:
e, h, k, m, n, o, p, q, t, u, v, x


question:
['d', '6991', '7317', '5003', '9801', '9543', '8345', '2095', 'z', '4391', '755', 'k', '1497', '7271', '895', 'o']
answer:

d, k, o, z