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: 'there is no image here to provide a caption for'. Find frequency of the letter 'o'

Answer: 5

Question: Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'

Answer: 2

Question: Sentence: 'a large herd of zebras are in the grass together'. Find frequency of the letter 'i'

Answer:
1