instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'cooked fish and green broccoli share a single white plate'. Find frequency of the letter 'c'
answer:
3


question:
Sentence: 'two laptop computers sitting on top of a white table'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'three double decker busses cruise down the street'. Find frequency of the letter 'w'
answer:

1