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

[EX Q]: Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'
[EX A]: 4

[EX Q]: Sentence: 'a photo of a toilet which is not clean'. Find frequency of the letter 'w'
[EX A]: 1

[EX Q]: Sentence: 'a man in a tie and woman with purple hair smile for the camera'. Find frequency of the letter 'p'
[EX A]:
2