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

[EX Q]: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'
[EX A]: 3

[EX Q]: Sentence: 'a white plate sitting on top of a plate filled with food'. Find frequency of the letter 'e'
[EX A]:
4