def parse_line(line_string):
    """standardize line describtion.

    Bruker saves line description in all caps
    and omits the type if only one exists instead of
    using alfa"""
    if len(line_string) == 1:
        line_string = line_string + 'a'
    elif len(line_string) > 2:
        line_string = line_string[:2]
    return line_string.capitalize()
