instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two bears swim in a blue pool of water'. Find frequency of the letter 'o'
answer:
4


question:
Sentence: 'people waiting on a train platform in a wooded area'. Find frequency of the letter 'p'
answer:
3


question:
Sentence: 'two lines of motorcycles driving down the road while a crowd watches'. Find frequency of the letter 'w'
answer:

5