def release_vcf_path(data_type: str, version: str, contig: str) ->str:
    """
    Publically released VCF. Provide specific contig, i.e. "20", to retrieve contig
    specific VCF

    :param data_type: One of "exomes" or "genomes"
    :param version: One of the release versions of gnomAD on GRCh37
    :param contig: Single contig "1" to "Y"
    :return: Path to VCF
    """
    contig = f'.{contig}' if contig else ''
    return (
        f'gs://gnomad-public/release/{version}/vcf/{data_type}/gnomad.{data_type}.r{version}.sites{contig}.vcf.bgz'
        )
