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

Sentence: 'a tall building with antenna stands before a jet flying in the background'. Find frequency of the letter 't'
6

Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'
3

Sentence: 'a rose that is laying down on a bed'. Find frequency of the letter 'a'

4