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

[EX Q]: Sentence: 'a young elephant is touching a bigger elephant with its trunk'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'a man on a skateboard going down a ramp while people are watching'. Find frequency of the letter 'w'
[EX A]: 3

[EX Q]: Sentence: 'a couple of kids that are making a pizza'. Find frequency of the letter 'i'
[EX A]:
3