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

[Q]: Sentence: 'a dog on a couch near many pillows'. Find frequency of the letter 'p'
[A]: 1

[Q]: Sentence: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'
[A]: 1

[Q]: Sentence: 'a train that says "santa fe vista canyon"'. Find frequency of the letter 'y'
[A]:
2