instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'
answer:
7


question:
Sentence: 'a man with a skateboard that is in the street'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'two bathroom sinks next to each other in a restroom'. Find frequency of the letter 'n'
answer:

3