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

[EX Q]: Sentence: 'a tall building with antenna stands before a jet flying in the background'. Find frequency of the letter 't'
[EX A]: 6

[EX Q]: Sentence: 'a couple of boys in a field playing baseball'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'the man is standing next to the table with his hand out'. Find frequency of the letter 'i'
[EX A]:
4