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

[EX Q]: Sentence: 'a bus is stopped in front of a graphic statue'. Find frequency of the letter 'e'
[EX A]: 2

[EX Q]: Sentence: 'two people in a snowy place near a wooden fence'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'a kid with a skateboard that is jumping in the air'. Find frequency of the letter 'i'
[EX A]:
6

