instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'
answer:
1


question:
Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
answer:
1


question:
Sentence: 'table with an empty white blow and a plate of pastries'. Find frequency of the letter 'w'
answer:

3