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

[Q]: Sentence: 'a cat sleeping near lots of pairs of shoes'. Find frequency of the letter 'r'
[A]: 2


[Q]: Sentence: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'
[A]: 3


[Q]: Sentence: 'a car drives past a street sign with a list of many names'. Find frequency of the letter 't'
[A]:
5