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

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

[EX Q]: Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
[EX A]: 3

[EX Q]: Sentence: 'a work desk that holds a computer on top'. Find frequency of the letter 'e'
[EX A]:
2