def most_popular(read_tweet,date1,date2):
    popular=[]
    for candidate,tweets in read_tweet.items():
        match=True
        for x in tweets:
            if not (date1<=x[2]<=date2):
                match=False
        if match:
            for candidate in read_tweet:
                occur=0
                for x in read_tweet[candidate]:
                    occur+= x[4]+ x[5]
                popular.append([occur,candidate])
    popular.sort(reverse=True)
    return [candidate for x, candidate in popular]

#alternative way of doing the last part
#for i,item in enumerate(popular):
#    mylist[i] = item[1]