In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'wooden and black bench on the side of the road'. Find frequency of the letter 'a'

Answer: 3


Question: Sentence: 'a ready to eat pizza on a rack'. Find frequency of the letter 'r'

Answer: 2


Question: Sentence: 'someone holding a hot dog with mustard and ketchup'. Find frequency of the letter 'h'

Answer:
4