instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'
answer:
1

question:
Sentence: 'people playing wii bowling in a modern library'. Find frequency of the letter 'o'
answer:
3

question:
Sentence: 'a traffic light at the corner of a business building with traffic going by'. Find frequency of the letter 'a'
answer:
5