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: 'two zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a view of mountains and plains as seen from an airplane window'. Find frequency of the letter 's'
answer:

4


