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: 'two men are playing a video game as another sits watching'. Find frequency of the letter 'a'

Answer: 7


Question: Sentence: 'a view from a bathroom shows an open door'. Find frequency of the letter 'o'

Answer: 7


Question: Sentence: 'a young man riding a skateboard in a skate park'. Find frequency of the letter 'g'

Answer:
2