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 big bear walks through some grass'. Find frequency of the letter 'a'

Answer: 4


Question: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'

Answer: 3


Question: Sentence: 'some type of fruit that has been cut open on the kitchen counter'. Find frequency of the letter 'e'

Answer:
8