instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a passenger bus that is driving down the street'. Find frequency of the letter 'r'
answer:
3

question:
Sentence: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'
answer:
8

question:
Sentence: 'two parrots sitting side by side on a perch'. Find frequency of the letter 'h'
answer:
1