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Tom Black is an unknown author. He started writing short stories when he was a schoolboy. His short stories usually consist of four sentences, and, what's more, each story has an unpredictable average sentiment score. He is likely to become a famous writer soon!
Your task is to download one of his short stories, calculate the sentiment score for each sentence and find the average sentiment score of the whole story.
The average sentiment score is calculated as follows:
where is a sum of all the sentiment scores, and is the total number of the sentences in a story.
