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

[Q]: Sentence: 'a group of cars and house on truck passing in a street'. Find frequency of the letter 'i'
[A]: 2


[Q]: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'
[A]: 6


[Q]: Sentence: 'a laptop sitting on a couch with cell phone on a table'. Find frequency of the letter 't'
[A]:
5