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: 'small black bird with red on its head standing on a tree branch'. Find frequency of the letter 'b'

Answer: 3


Question: Sentence: 'an elephant holding a carrot with its trunk'. Find frequency of the letter 't'

Answer:
5