Teacher: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.
Teacher: Now, understand the problem? Solve this instance: ['h', '2279', 'y', 's', '8231', 'e', '4203', 'g', '6011', '5991', '4401', '4279', 't', 'q', 'x', 'e', '3179', 'j', '8841', '679', '8113', 'y', 'w', 'v', 'q', 'o', '9919', '8193', '7199', 'f', 'm', '3889', '8225', 'c', '1299', 'm']
Student:
c, e, f, g, h, j, m, o, q, s, t, v, w, x, y