instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person working at an airport, outside of an airplane'. Find frequency of the letter 'r'
answer:
5

question:
Sentence: 'a dog on a couch near many pillows'. Find frequency of the letter 'p'
answer:
1

question:
Sentence: 'a building with a large clock on the front'. Find frequency of the letter 'e'
answer:
2