instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a jet flying through the clear blue sky'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'a man hits a tennis ball with a racket on the court'. Find frequency of the letter 'c'
answer:
2


question:
Sentence: 'a rear view mirror shows a giraffe looking behind a car'. Find frequency of the letter 'a'
answer:

6