def read_last_seen(FILE_NAME: str) -> int:
    """
    gets the id of last seen tweet
    Args:
        FILE_NAME: static file name which stores the last seen id
    Returns:
        last_seen_id: id of the tweet
    """
    file_read = open(FILE_NAME, 'r')
    readed = file_read.read()
    if readed != "":
        last_seen_id = int(readed.strip())
        file_read.close()
        return last_seen_id
    else:
        return 0
    print("Last Seen ID is readed.")