In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a airplane view of a big factory some people and cars'. Find frequency of the letter 'f'

Answer: 2


Question: Sentence: 'a dog is shown sitting on rocks by the beach'. Find frequency of the letter 'a'

Answer: 2


Question: Sentence: 'a decorative white clock sits on a white surface'. Find frequency of the letter 'r'

Answer:
2