instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
answer:
2


question:
Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'
answer:
1


question:
Sentence: 'a bunch of people playing frisbee in a park'. Find frequency of the letter 's'
answer:

1