instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'
answer:
2


question:
Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'a ready to eat pizza on a rack'. Find frequency of the letter 'r'
answer:

2