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

[EX Q]: Sentence: 'a man hits a tennis ball with a racket on the court'. Find frequency of the letter 'c'
[EX A]: 2

[EX Q]: Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'a marble bathroom vanity under a large round mirror'. Find frequency of the letter 'r'
[EX A]:
8