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

[EX Q]: Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'
[EX A]: 6

[EX Q]: Sentence: 'a large cooked pizza on a dining table'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a baseball player pitching a ball at a batter'. Find frequency of the letter 'a'
[EX A]:
9