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

[Q]: Sentence: 'a person on a skateboard going down a ramp'. Find frequency of the letter 'n'
[A]: 4


[Q]: Sentence: 'a green bus driving in a street filled with heavy traffic'. Find frequency of the letter 'v'
[A]: 2


[Q]: Sentence: 'this body of water is serving as a watering hole for a herd of elephants'. Find frequency of the letter 'w'
[A]:
2