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

[Q]: Sentence: 'a tennis player after hitting a shot back to the other side of the court'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'a person placing their hand on the bottom of the bed in a dark room'. Find frequency of the letter 's'
[A]:
1