In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'

Answer: 2

Question: Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'

Answer: 2

Question: Sentence: 'this dish has a slice cut from it'. Find frequency of the letter 's'

Answer:
4