instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
answer:
5

question:
Sentence: 'a man on stiltz is standing under a pink umbrella'. Find frequency of the letter 's'
answer:
3

question:
Sentence: 'a white fire hydrant posed by the side of a business building'. Find frequency of the letter 'e'
answer:
6