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

[EX Q]: Sentence: 'a group of cows that are standing in the grass'. Find frequency of the letter 'g'
[EX A]: 3

[EX Q]: Sentence: 'a train sits on a railroad track as a metal awning covers it'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'a plate topped with pasta and and onions'. Find frequency of the letter 't'
[EX A]:
4