instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'a plate full of food with several empty plates in the background'. Find frequency of the letter 's'
answer:

2