Challenge: Anagram Problem
Discover how to create a Python function that determines whether two strings are anagrams by comparing letters case-insensitively. Learn to return defined outputs and test your program with sample inputs to validate results effectively.
Task
Write a function that accepts two strings as parameters and checks whether these strings are anagrams of each other. An anagram is a text formed by rearranging the letters of another piece of text.
The strings should not be case-sensitive, meaning that Cats and AcTs are anagrams.
The function should return 1 when the strings are anagrams and -1 otherwise.