def reformat_element_symbol(element_string):
    """
    Reformat the string so the first letter is uppercase and all subsequent
     letters lowercase.

    Parameters
    ----------
    element_string : str
        Inputted element symbol

    Returns
    -------
    str
        Returned reformatted element symbol
    """

    return element_string[0].upper() + element_string[1:].lower()