In this task, you need to count the number of times the given letter appears in the given sentence.

[Q]: Sentence: 'a red train traveling down train tracks near a forest'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'man in red shirt with black suitcase standing outside of building'. Find frequency of the letter 'i'
[A]: 8


[Q]: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'
[A]:
6