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 man and a woman are walking down the street with an umbrella over their heads'. Find frequency of the letter 'w'

Answer: 4


Question: Sentence: 'a desk covered in notepads, a laptop and other devices'. Find frequency of the letter 'c'

Answer: 2


Question: Sentence: 'a train is going down the tracks near a station'. Find frequency of the letter 'e'

Answer:
2