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

[EX Q]: Sentence: 'a piece of film shows two street signs crossing each other'. Find frequency of the letter 'f'
[EX A]: 2

[EX Q]: Sentence: 'a young man with glasses on is taking a big bite'. Find frequency of the letter 's'
[EX A]: 4

[EX Q]: Sentence: 'a group of kids and adults eating cake at a table'. Find frequency of the letter 't'
[EX A]:
4