def hello(name):
    """
    Simple function that prints "Hello X" for 
    an input `name`. 

    Parameters
    ----------
        name : str
            The name of the person.

    Returns
    -------
        greeting: str
            The message - Hello `name`.
    """
    if type(name) != str:
        raise ValueError("Name should be a string")
    greeting = "Hello " + name
    return greeting