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

[EX Q]: Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'
[EX A]: 1

[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: 'female appears to be upset with something having to do with her computer'. Find frequency of the letter 'h'
[EX A]:
5