In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'an old boat on a beach near a large body of water'. Find frequency of the letter 'a'

Answer: 8


Question: Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'

Answer: 5


Question: Sentence: 'two white sports cars and a flashy red motorcycle are on a display'. Find frequency of the letter 'w'

Answer:
2