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

[Q]: Sentence: 'a small doughnut held in a persons hand'. Find frequency of the letter 'n'
[A]: 4


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


[Q]: Sentence: 'four people playing wii in the living room'. Find frequency of the letter 'w'
[A]:
1