Bonjour, j’ai un devoir en anglais mais je n’arrive pas à le faire si quelqu’un pourrait m’aider?

You write a letter to react to the discovery of a Banksy's work in your high school.

You must respect the form of a letter (a recipient, a date, a subject, an organized development, a polite formula, and a signature)

Examples of polite formulas, to start =Dear Mister/ Miss... to finish, Respectfully, (For more, you can search online.)