In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'

Answer: 1


Question: Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'

Answer: 1


Question: Sentence: 'a very tall building with a plaque hanging off of it's side'. Find frequency of the letter 'a'

Answer:
5