instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a young boy bouncing a tennis ball on a tennis racquet'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a scene at night; a plane alone on a runway with lit-up city buildings on the horizon'. Find frequency of the letter 'w'
answer:
2


question:
Sentence: 'zebras in an orphanage and a car with the tourists'. Find frequency of the letter 'r'
answer:

4