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

[EX Q]: Sentence: 'a closet with a fan, luggage and various boxes'. Find frequency of the letter 'a'
[EX A]: 6

[EX Q]: Sentence: 'a man playing baseball on a television set'. Find frequency of the letter 'l'
[EX A]: 4

[EX Q]: Sentence: 'an old 60s-era bus with the name "bertie bubble bus"'. Find frequency of the letter 'r'
[EX A]:
2