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

[EX Q]: Sentence: 'a man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'
[EX A]: 1

[EX Q]: Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'a person jumping over a ramp with a skateboard'. Find frequency of the letter 'g'
[EX A]:
1