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 man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'
answer:

2