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

[EX Q]: Sentence: 'cooked fish and green broccoli share a single white plate'. Find frequency of the letter 'c'
[EX A]: 3

[EX Q]: Sentence: 'a double-decker bus covered in children's illustrations driving next to a van'. Find frequency of the letter 'a'
[EX A]: 4

[EX Q]: Sentence: 'the cats are eating and getting a drink of water'. Find frequency of the letter 'a'
[EX A]:
6