def update_mona_fields_names(message):
    """
    Changes names of fields that starts with "MONA_" to start with "MY_MONA_"
    """
    message_copy = dict(message)
    for key in message:
        if key.startswith("MONA_"):
            message_copy[f"MY_{key}"] = message_copy.pop(key)

    return message_copy