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

[EX Q]: Sentence: 'a closeup view of a bathroom sink, that is very modern'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'boat oar held up out the water to show it's rust'. Find frequency of the letter 'o'
[EX A]:
5