def is_wgs_accession_format(contig_accession):
    """
    Check if a Genbank contig is part of WGS (Whole Genome Shotgun) sequence

    :param contig_accession: Genbank contig accession (ex:  CM003032.1)
    :return: True if the provided contig is in the WGS format
    """
    wgs_prefix = contig_accession[:4]
    wgs_numeric_suffix = contig_accession[4:].replace(".", "")
    return str.isalpha(wgs_prefix) and str.isnumeric(wgs_numeric_suffix)