instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a large cooked pizza on a dining table'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a group of people stand inside of a big room'. Find frequency of the letter 'o'
answer:
6


question:
Sentence: 'a living room with a television and a couch'. Find frequency of the letter 'i'
answer:

5