Given an input String, first decide if the String starts with "I am ", like "I am hungry". If it does not start with "I am ", return "I don't understand". If it does start with "I am ", return a response that includes part of the input in the form "Why are you (rest of input)?" If you are still confused, see the input/output test cases.

HINT: use substring to capture the rest of the input, which becomes part of the output.