instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'a no parking sign on a building near the road'. Find frequency of the letter 'n'
answer:

6