instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
answer:
3


question:
Sentence: 'black and white photograph of man and woman sitting on a bench'. Find frequency of the letter 'w'
answer:
2


question:
Sentence: 'a horse behind a fence eating some grass'. Find frequency of the letter 'n'
answer:

3