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

[EX Q]: Sentence: 'a white bowl filled with peeled orange slices'. Find frequency of the letter 's'
[EX A]: 2

[EX Q]: Sentence: 'a little dog on a table while a dog groomer cuts its fur'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'a group of ducks swim in water that is shared with gold fish'. Find frequency of the letter 'e'
[EX A]:
2