In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'

A: 1
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Q: Sentence: 'a young woman dressed in green and black operating a remote control'. Find frequency of the letter 'r'

A: 5
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Q: Sentence: 'a truck with iuts trailer exposed showing its contents'. Find frequency of the letter 'r'

A:
3
****