instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'wooden and black bench on the side of the road'. Find frequency of the letter 'a'
answer:
3


question:
Sentence: 'two women walk across a street-crossing in a city with cars and a bus driving by'. Find frequency of the letter 'c'
answer:

4