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: ['r', 'h', 'r', 'o', '7205', 'j', '9119', 'o', 's', 'q', 'c', 'l', '1125', '3171', 'c', '3785', '7267', '625', '2963', 'h', '5219', 'r', 'w', 'u', '9145', '6817', 'a', 'i', '8809', 'm', 'l', '6875', 'l', '9819', '7893']
A:
a, c, h, i, j, l, m, o, q, r, s, u, w