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

[EX Q]: Sentence: 'a picture of two men on a motorcycle in front of a railroad track'. Find frequency of the letter 'n'
[EX A]: 4

[EX Q]: Sentence: 'a white bathroom sink sitting next to a toilet'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'a laptop with an i love sticker on the front and google in the back'. Find frequency of the letter 'i'
[EX A]:
4