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: 'hotel towels with sunglasses perched and hotel business cards and catalog'. Find frequency of the letter 'o'
answer:
4


question:
Sentence: 'a man holding up a cell phone to take a picture'. Find frequency of the letter 'n'
answer:

3