def get_weekday_word(number):
    """
    Using weekday index return its word representation
    :param number: number of weekday [0..6]
    :return: word representation
    """
    weekdays = (
        'monday',
        'tuesday',
        'wednesday',
        'thursday',
        'friday',
        'saturday',
        'sunday'
    )
    return weekdays[number]