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

Q: Sentence: 'some sheep are standing in a grassy field'. Find frequency of the letter 'n'

A: 3
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Q: Sentence: 'guy leans on truck's hood while taking pics next to parked motorcycles'. Find frequency of the letter 's'

A: 4
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Q: Sentence: 'plastic fruit bins containing oranges, tangerines, and apples'. Find frequency of the letter 'a'

A:
6
****