instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'
answer:
1

question:
Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'
answer:
1

question:
Sentence: 'people at a long wooden table in a tavern'. Find frequency of the letter 'n'
answer:
4