instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'a man hitting a tennis ball with a tennis racquet'. Find frequency of the letter 't'
answer:
6


question:
Sentence: 'a guy surfs a wave with his surfboard'. Find frequency of the letter 's'
answer:

4


