In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'decorated baseball cake in a clear plastic box'. Find frequency of the letter 'k'

Answer: 1


Question: Sentence: 'a man riding a white surfboard on a large wave'. Find frequency of the letter 'a'

Answer: 7


Question: Sentence: 'cows standing in the grass near trees and a fence'. Find frequency of the letter 't'

Answer:
3