In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'

Answer: 1


Question: Sentence: 'a closet with a fan, luggage and various boxes'. Find frequency of the letter 'a'

Answer: 6


Question: Sentence: 'interior view of a microwave with a refrigerator in the background'. Find frequency of the letter 'w'

Answer:
3