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 white paper plate with a slice of pizza on it'. Find frequency of the letter 'h'
[A]: 2


[Q]: Sentence: 'a set of four bikers riding motorcycles side by side'. Find frequency of the letter 'b'
[A]:
2