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.
Problem:['1919', '7691', '5763', 'j', '7701', '6293', '8583', '6677', 'r', 'i', '6567', '1601', '5857', '6323', '7949', 'f', '7331', 'w', 'm', '8161', 'a', 'y', '1979', 'i', 'x', 'l', '6971', 'n', 'x', 'm', '9485', 'n', '6357', 'a', '8975', '5495', '5033', '5457']
Solution:
a, f, i, j, l, m, n, r, w, x, y