instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'
answer:
3


question:
Sentence: 'a young boy bouncing a tennis ball on a tennis racquet'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a female snowboarder sitting on the snow with her board'. Find frequency of the letter 'a'
answer:

4