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

[Q]: Sentence: 'guy leans on truck's hood while taking pics next to parked motorcycles'. Find frequency of the letter 's'
[A]: 4


[Q]: Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'
[A]: 3


[Q]: Sentence: 'a bunch of kites that are being flown in the sky'. Find frequency of the letter 'w'
[A]:
1