In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a person on a skateboard going down a ramp'. Find frequency of the letter 'n'

Answer: 4


Question: Sentence: 'two persons standing outside a moving sub train'. Find frequency of the letter 'a'

Answer: 3


Question: Sentence: 'the young girl is playing frisbee in the court yard'. Find frequency of the letter 'r'

Answer:
4