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

[EX Q]: Sentence: 'a bird is standing on the ledge of the building'. Find frequency of the letter 't'
[EX A]: 3

[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 woman and her kids standing at a carnival'. Find frequency of the letter 'i'
[EX A]:
3