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 young boy standing in front of a counter with dougnuts'. Find frequency of the letter 'o'

Answer: 6


Question: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'

Answer: 1


Question: Sentence: 'a desk with a computer, mini book shelf and toy on it'. Find frequency of the letter 's'

Answer:
2