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

Answer: 3


Question: Sentence: 'there is a zebra that is walking enar a car'. Find frequency of the letter 'r'

Answer: 4


Question: Sentence: 'a small doughnut held in a persons hand'. Find frequency of the letter 'n'

Answer:
4