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

Answer: 3

Question: Sentence: 'a group of people are playing soccer on a beach'. Find frequency of the letter 'l'

Answer: 2

Question: Sentence: 'three people sit at a restaurant table drinking wine'. Find frequency of the letter 'h'

Answer:
1