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 scene at night; a plane alone on a runway with lit-up city buildings on the horizon'. Find frequency of the letter 'w'

Answer: 2


Question: Sentence: 'two zebras in a field with trees and grass and dirt'. Find frequency of the letter 'e'

Answer:
4