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 dog is shown sitting on rocks by the beach'. Find frequency of the letter 'a'

Answer: 2

Question: Sentence: 'an empty clean kitchen with island, marble countertops , stove and cabinetry'. Find frequency of the letter 'l'

Answer: 3

Question: Sentence: 'a sandwich that is on a plate on a table'. Find frequency of the letter 'a'

Answer:
7