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 sitting quietly on a park bench'. Find frequency of the letter 'a'

Answer: 2

Question: Sentence: 'a man in a sweatshirt is taking his own picture'. Find frequency of the letter 'u'

Answer: 1

Question: Sentence: 'a cut in half sub and other foods are ready to eat'. Find frequency of the letter 'o'

Answer:
4