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 family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'

Answer: 8

Question: Sentence: 'a giraffe shares a habitat with a zebra, an ostrich, and an okapi'. Find frequency of the letter 'e'

Answer: 3

Question: Sentence: 'a squirrel is eating while standing on a wooden post'. Find frequency of the letter 's'

Answer:
4