instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'
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: 'the bench is chained to the outside door handle'. Find frequency of the letter 'e'
answer:

6