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

[Q]: Sentence: 'a couple of people that are on a baseball field'. Find frequency of the letter 'c'
[A]: 1


[Q]: Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'
[A]: 1


[Q]: Sentence: 'a man holding a blue and white striped tie'. Find frequency of the letter 'i'
[A]:
4