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

[EX Q]: Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
[EX A]: 1

[EX Q]: Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'
[EX A]: 5

[EX Q]: Sentence: 'food and metal pitchers are sitting on a countertop'. Find frequency of the letter 'p'
[EX A]:
2