instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'the snowboarder wearing a dark helmet sprays snow into the air'. Find frequency of the letter 'w'
answer:
3


question:
Sentence: 'a log in the water with three birds perched on it'. Find frequency of the letter 'r'
answer:

4