In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'

A: 4
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Q: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'

A: 7
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Q: Sentence: 'a flock of sheep on a paved mountain road cause a traffic jam'. Find frequency of the letter 's'

A:
2
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