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

[Q]: Sentence: 'several zebras  and a giraffe in an enclosure'. Find frequency of the letter 's'
[A]: 3


[Q]: Sentence: 'people waiting on a train platform in a wooded area'. Find frequency of the letter 'p'
[A]: 3


[Q]: Sentence: 'a man is leaning on a microwave  and holding onto a chair in a break room'. Find frequency of the letter 'o'
[A]:
7