def getCorrectRegionName(region: str):
    """
    Sanitize and validate region name variable.

    :param region: a string with a name of distribution region
    :return: string
    """
    region = region.lower()
    valid_regions = ["zapad", "sever", "stred", "vychod", "morava"]
    if region in valid_regions:
        return region
    else:
        raise KeyError(f"Region {region} is not valid region.")