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 zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'

Answer: 3


Question: Sentence: 'food sitting in bowls on table with checked tablecloth'. Find frequency of the letter 't'

Answer: 6


Question: Sentence: 'an automobile with a timer attached on a city street'. Find frequency of the letter 'o'

Answer:
3