In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'

Answer: 6


Question: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'

Answer: 3


Question: Sentence: 'a motorcycle is seen on a dirt road'. Find frequency of the letter 'd'

Answer:
2