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: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'

Answer: 3


Question: Sentence: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'

Answer: 1


Question: Sentence: 'a man posing and riding a wave on a surfboard'. Find frequency of the letter 'd'

Answer:
3