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

[Q]: Sentence: 'black and white photograph of man and woman sitting on a bench'. Find frequency of the letter 'w'
[A]: 2


[Q]: Sentence: 'a double-decker bus covered in children's illustrations driving next to a van'. Find frequency of the letter 'a'
[A]: 4


[Q]: Sentence: 'two men are walking through a tent city'. Find frequency of the letter 'h'
[A]:
2