instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a little dog on a table while a dog groomer cuts its fur'. Find frequency of the letter 'r'
answer:
3


question:
Sentence: 'a police officer who is riding on a horse'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'a very cute  giraffe standing by some bushes'. Find frequency of the letter 'h'
answer:

1