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: ['5393', '6219', 'g', 't', 'j', '6613', 'g', '9327', 'd', 'e', '4051', '6047', '2193', '2835', '5315', '8385', '5669', '9105', 's', '3831', 't', 's', '6847', 'b', 'w']
A:
b, d, e, g, j, s, t, w