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

Q: Sentence: 'a close up of a train on a track in the dark'. Find frequency of the letter 'a'

A: 6
****
Q: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'

A: 6
****
Q: Sentence: 'a blue sculpture with a clock on it outside'. Find frequency of the letter 'a'

A:
2
****