In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

Answer: 6


Question: Sentence: 'a display case filled with lots of different clocks'. Find frequency of the letter 'w'

Answer: 1


Question: Sentence: 'a group of three dogs laying on a kitchen floor'. Find frequency of the letter 'r'

Answer:
3