def remove_tweet_id(tweet):
    """
    DESCRIPTION: 
                removes the id from a string that contains an id and a tweet
                e.g "<id>,<tweet>" returns "<tweet>"
    INPUT: 
            tweet: a python string which contains an id concatinated with a tweet of the following format:
           "<id>,<tweet>"
    OUTPUT: 
            only the tweet is returned as a python string
    """
    return tweet.split(',', 1)[-1]