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

[EX Q]: Sentence: 'hand holding a white calculator inside a store'. Find frequency of the letter 'o'
[EX A]: 3

[EX Q]: Sentence: 'a car accident has slowed traffic as a clean up crew works'. Find frequency of the letter 'f'
[EX A]: 2

[EX Q]: Sentence: 'are the dogs being friendly with each other or chasing each other'. Find frequency of the letter 'h'
[EX A]:
7