In this task, you need to count the number of times the given letter appears in the given sentence.
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Question: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'

Answer: 3


Question: Sentence: 'a green bus driving in a street filled with heavy traffic'. Find frequency of the letter 'v'

Answer: 2


Question: Sentence: 'a tennis player with a racket on a court'. Find frequency of the letter 'r'

Answer:
3