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

[EX Q]: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'
[EX A]: 7

[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: 'a woman dressed as tooth fairy holding a wand'. Find frequency of the letter 'o'
[EX A]:
4