Detailed Instructions: 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: ['2995', 'j', 'l', '9415', '7121', 'r', 'b', '8545', '7733', 'z', '6435', '8123', '1731', 'h', 'l', 'h', 'd', 'r', 'l', 'z', 'm', 'i', '6575', 'l', '5177', 'p', 'w', '4981', '1109', '8807']
A:
b, d, h, i, j, l, m, p, r, w, z