instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man with a skateboard that is in the street'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'people walk on the sidewalk near the buildings'. Find frequency of the letter 'i'
answer:

3