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

[Q]: Sentence: 'a bunch of green bananas is hanging on a tree'. Find frequency of the letter 'n'
[A]: 7


[Q]: Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'
[A]: 6


[Q]: Sentence: 'a bench on an outlook point over a valley'. Find frequency of the letter 'e'
[A]:
3