instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a yellow fire hydrant in the forefront of a roadway'. Find frequency of the letter 'r'
answer:
5

question:
Sentence: 'a man holding a frisbee high into the air'. Find frequency of the letter 'a'
answer:
4

question:
Sentence: 'the row of motorcycles is displaying the flags'. Find frequency of the letter 'e'
answer:
3