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

[EX Q]: Sentence: 'two men sitting quietly on a park bench'. Find frequency of the letter 'a'
[EX A]: 2

[EX Q]: Sentence: 'a closeup view of a bathroom sink, that is very modern'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'a stop sign some cars grass lights and a parking lot'. Find frequency of the letter 's'
[EX A]:
7