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

[Q]: Sentence: 'two metal benches on an empty train platform'. Find frequency of the letter 'n'
[A]: 4

[Q]: Sentence: 'a man opening up a package sitting on a couch'. Find frequency of the letter 'n'
[A]: 5

[Q]: Sentence: 'a boy in green shirt sitting on chair by microwave'. Find frequency of the letter 'r'
[A]:
4