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

[EX Q]: Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
[EX A]: 1

[EX Q]: Sentence: 'two men are playing a game with controllers'. Find frequency of the letter 't'
[EX A]:
3