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 black cat laying down on a bed'. Find frequency of the letter 'y'

Answer: 1


Question: Sentence: 'a birthday cake with a number one and three candle'. Find frequency of the letter 'w'

Answer: 1


Question: Sentence: 'a cat laying in a bed in a room'. Find frequency of the letter 'l'

Answer:
1