instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
answer:
1


question:
Sentence: 'a flock of sheep grazing in a park'. Find frequency of the letter 'f'
answer:
2


question:
Sentence: 'a bathroom with two sinks, wood paneling, and a large mirror'. Find frequency of the letter 'r'
answer:

5