def ZwiftCatEmoji(zcat=None):
    """
    Return str to emoji for backpedal server
    :param zcat: str A+ A B C D E
    :return: str zcat emoji for backpedal server
    """
    if zcat == None:
        return None
    if zcat == 'A+':
        return ':zcataplus:'
    if zcat in ['A','B','C','D','E']:
        return ':zcat' + zcat.lower() + ':'