instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a row of vintage cars in a grassy field'. Find frequency of the letter 'v'
answer:
1


question:
Sentence: 'a woman at a table checking her cell phone'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a warning sign on the side of the road'. Find frequency of the letter 'w'
answer:

1