instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'
answer:
4


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 man and an elephant walking together on the street'. Find frequency of the letter 'a'
answer:

6