instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'different sets of luggage in a baggage claim area'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'a dog sitting in the back of a truck flat bed'. Find frequency of the letter 'h'
answer:
1


question:
Sentence: 'there is a green bus on a narrow street'. Find frequency of the letter 'r'
answer:

5