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

Sentence: 'a closet with a fan, luggage and various boxes'. Find frequency of the letter 'a'
6

Sentence: 'a lady is standing near a luggage stand at the air port'. Find frequency of the letter 'a'
9

Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

6