instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a tennis player after hitting a shot back to the other side of the court'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a bird on a tree is flapping its wings'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'a white plate topped with a breakfast sandwich and a cup of coffee'. Find frequency of the letter 'u'
answer:

1