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

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

A: 7
****
Q: Sentence: 'a car accident has slowed traffic as a clean up crew works'. Find frequency of the letter 'f'

A: 2
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Q: Sentence: 'a man is playing tennis on a tennis court'. Find frequency of the letter 's'

A:
3
****