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 mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'

Answer: 3


Question: Sentence: 'a stuffed animal sitting on an empty bed'. Find frequency of the letter 'u'

Answer: 1


Question: Sentence: 'a man in a hat and glasses holding a toothbrush in a bathroom'. Find frequency of the letter 'a'

Answer:
9