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 batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'

Answer: 3

Question: Sentence: 'a woman walking on a shore next to a river'. Find frequency of the letter 'v'

Answer: 1

Question: Sentence: 'a red train is easily recognizable in between the mountains'. Find frequency of the letter 'l'

Answer:
2