instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'
answer:
1


question:
Sentence: 'a photo of a small boat on a shore'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a wet road filled with many cars riding it'. Find frequency of the letter 'w'
answer:

2