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

[EX Q]: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
[EX A]: 3

[EX Q]: Sentence: 'a little boy sitting on a bed in a bedroom'. Find frequency of the letter 'e'
[EX A]: 3

[EX Q]: Sentence: 'a cat lounges in an open piece of luggage'. Find frequency of the letter 'l'
[EX A]:
2