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

[Q]: Sentence: 'a teenager witting on a futon couch holding gaming controls in both hands'. Find frequency of the letter 'c'
[A]: 3


[Q]: Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'a street sign reading give way next to a road'. Find frequency of the letter 'i'
[A]:
3