In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'

Answer: 3


Question: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'

Answer: 6


Question: Sentence: 'a bird sitting on the side of a custom tree house'. Find frequency of the letter 's'

Answer:
4