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 picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'

Answer: 4

Question: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'

Answer: 2

Question: Sentence: 'a cat laying next to tape and a pile of papers'. Find frequency of the letter 'c'

Answer:
1