In this task, you need to count the number of words in a sentence that contain the given letter
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Question: Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.

Answer: 0

Question: Sentence: 'a man and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.

Answer: 4

Question: Sentence: 'two men that are playing a game of tennis'. How many words contain the letter 'n' in the sentence.

Answer:
3