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 plane with stairs next to it sitting in a large lot'. Find frequency of the letter 'i'

Answer: 6


Question: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'

Answer: 5


Question: Sentence: 'a person in a red suit snowboarding down a hill'. Find frequency of the letter 'o'

Answer:
4