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.

Q: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']

A: d, i, j, m, s, t, v, z
****
Q: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']

A: b, e, n, t, y
****
Q: ['851', '8903', 'r', '3625', '5653', '7099', 'k', '8691', 'k', '4347', 'b', '1459', 'h']

A:
b, h, k, r
****